Here is a step-by-step guide on how to add a link to your Instagram bio:

1. Open the Instagram app on your mobile device.
2. Tap on your profile icon located at the bottom right corner of the screen.
3. Tap on "Edit Profile" located at the top of the screen.
4. In the "Website" field, add your link by typing it in manually or copying and pasting it there from another source.
5. Tap "Done" in the top right corner of the screen.

That's it! Your link will now be visible in your Instagram bio.