You can edit your Instagram's "Link in Bio" on either the mobile app or desktop version of Instagram. There is no advantage to either method other than personal ease of use. Do whatever you're more comfortable with.
iOS Instructions:
- Open your Instagram app
- Tap your profile picture in the bottom right to go to your profile
- Tap "Edit Profile" at the top of the screen
- Tap the field next to "Website"
- Write your URL
- Tap "Done"
Android Instructions:
- Open your Instagram app
- Tap
in the bottom right to go to your profile
- Tap "Edit Profile" at the top of the screen
- Tap the field next to "Website"
- Write your URL
- Tap
Desktop Instructions:
- Log in to your Instagram account on Instagram.com
- Click your profile picture in the top right corner, then click
Profile.
- Click "Edit Profile" at the top of the screen
- Click into the field next to "Website"
- Write your URL
- Click Submit