To tag someone in a post on Instagram, follow these steps:
1. Start creating a new post: Tap on the "+" (plus) icon at the bottom center of the Instagram app's home screen to create a new post.
2. Choose a photo or video: Select a photo or video from your device's gallery or take a new one using the Instagram camera.
3. Edit the post: Apply filters, add captions, or make any desired edits to your post.
4. Add the tag: On the screen where you add your caption and location, you'll find an option to tag people. Tap on "Tag People."
5. Select the person to tag: On the next screen, you can search for the Instagram username of the person you want to tag. Start typing their username in the search bar, and a list of suggestions should appear. Select the correct username from the list.
6. Position the tag: After selecting the username, you'll be taken back to the main editing screen. You can now position the tag on the photo or video by dragging it to the desired location.
7. Complete the post: Add any additional captions, hashtags, or location tags to your post if desired. Once you're satisfied, tap on the "Share" button to publish the post.
By following these steps, you will successfully tag someone in your Instagram post. They will receive a notification and their username will be visible on the post, allowing others to tap on it and visit their profile.