Go to your Instagram (log in first) profile page, click GEAR icon or EDIT PROFILE on MOBILE. Click 'Add links' or 'links' next to a number. Type your link info. Click SAVE if a button is shown.
B1G screen folks - don't get mad - but you can't edit links-in-bio on Instagram for desktop or wide screen devices. They, Meta Platforms, made them rules, and as good social link ranchers we follow em'. We're here tellin' y'all how it is. Sorry for the frustration. Thx for understanding.