They can check their phone for your profile and find your username at the top of your Instagram profile. If you’re already logged into your Instagram account you can find your username by going to your profile, then going to the top and you’ll see your username.How to find or get Instagram user ID from username?
Method 1: Online Tool Get the username of the person whose user id you want to find. You can find it easily on Instagram app or website. Now head over to Instagram User Id Finder - Web tool. ... The tool will fetch the user id and show it to you in just a moment. Click on Copy User ID or you can do it manually if desired.