This article explains how to prevent people from tagging you in Instagram photos and videos without your approval using an iPhone or iPad. While people can still add your username to their posts, the tagged post will not appear in the "Posts where they've tagged you" area of the profile, unless approved by you.
Steps
Method 1 of 3: Apply for Manual Approval

Step 1. Open Instagram on your iPhone or iPad
The icon features a colorful camera with the tag "Instagram". It is usually found on the main screen.
On Instagram, any user in a post can tag you, unless they have been blocked. Use this method if you don't want posts you are tagged in to be added to the "Posts tagged you" section of your profile

Step 2. Click on your profile icon
It features a human silhouette (or your profile photo, if you have one set) and is located in the lower right corner of the screen. Your profile will then be opened.

Step 3. Press on ≡
This button is located in the upper right corner of your profile.

Step 4. Select Settings
This option is located at the bottom of the screen.

Step 5. Scroll down and select Post They Tagged You In
This option is located towards the central part of the menu titled "Privacy and Security".

Step 6. Swipe the "Add Automatically" switch to turn it off
Once you disable this feature, the posts you are tagged in will not be added to the "Posts tagged you" section unless you manually approve them.
To manually approve a post you've been tagged in, tap on the notification (the message that warns you about the tag) and then follow the onscreen instructions to accept the tag
Method 2 of 3: Hide a Photo or Video in which You Have Been Tagged

Step 1. Open Instagram on your iPhone or iPad
The icon features a colorful camera with the tag "Instagram". It is usually located on the main screen.
On Instagram, any user in a post can tag you, unless they have been blocked. Use this method if you don't want posts you are tagged in to be added to the "Posts tagged you" section of your profile

Step 2. Click on your profile icon
It features a human silhouette (or your profile photo, if you have one set) and is located in the lower right corner of the screen. Your profile will then be opened.

Step 3. Press the ≡ button
It is located in the upper right corner of your profile page.

Step 4. Select Settings
This option is located at the bottom of the screen.

Step 5. Scroll down and select Post They Tagged You In
It is located towards the central part of the menu entitled "Privacy and security".

Step 6. Click on Hide Photos
This will display the list of all posts in which you have been tagged and which are visible on your profile.

Step 7. Click on the post or posts you want to hide
The dot located in the upper right corner of each post will be selected.

Step 8. Select Hide
This option is located in the upper right corner. A confirmation message will appear.

Step 9. Select Hide from Profile
The photo or video will no longer appear on your profile.
Method 3 of 3: Block a User

Step 1. Open Instagram on your iPhone or iPad
The icon features a colorful camera with the tag "Instagram". It is usually found on the Home screen.
- The only way to actually prevent someone from tagging you in a post is to block their account. By blocking an account, the owner of the profile in question will not be able to see your posts or comments on Instagram (and vice versa).
- You should only do this if a user offends or annoys you with tags.

Step 2. Go to the profile of the person you want to block
Click on their name in the feed or on the magnifying glass at the bottom of the screen to search for their account.

Step 3. Tap on ⋯ on their profile
This button is located in the upper right corner of the screen.

Step 4. Select Block
This option is at the top of the menu. A confirmation message will appear.

Step 5. Click on Block to confirm
The user will then be blocked and will no longer be able to tag you in publications.