To unblock a user using the Instagram Web site on your desktop web browser:
Visit Instagram on the web in your browser.
Log in to your Instagram account using the log-in if you are not logged in.
Click Search.
Type the username or name of the user you want to unblock.
Now select the desired user from Autofill suggestions.
Note: Instagram user accounts may show as unavailable. In this case, you must unblock the account using the Instagram application for iOS or Android; Look up
Click the menu button next to the user name (<<·).
Select the menu that is displayed to unblock this user.
Can I see a list of all profiles blocked on Instagram?
Yes, Instagram maintains a list of all profiles blocked by you. To see it in the Instagram app for iOS or Android:
Go to your profile page on Instagram (👤).
In iOS, tap the top gear icon (⚙️).
On Android, tap the menu button (⋮) at the top of the page.
Under ACCOUNT, select the blocked user.
Tap to block any blocked user on their profile, where you can block them; Look up On Instagram web site, you can not access blocked users list.