As an Author, you can set your Link in Bio for your Instagram profile from your profile settings. It's very easy and just takes 2 steps and a few seconds to set it.
Step 1 : Access your Profile Settings
As a first step, open the Instagram app, look for your profile picture in the bottom-right corner, tap there, then tap Edit Profile. See example below:
Step 2 : set your Link in Bio
Now that you are in your Edit Profile page, look for the Website field and add your Link In Bio there. Finally, save your changes at the top of the page, as shown below:
All done! Your Link in Bio is now visible to all your followers and visitors!