First of all, I'm someone who isn't good at wording things, and it has got me in trouble multiple times. (English isn't my native language, that's maybe one of the reasons. I'm not so good at wording things in general though, even when speaking my native language.) But I will still try to be as clear as possible in this tutorial.
Step 1: First you have to favourite every stamp you're going to put on your profile, I would recommend putting them all in the same favourites collection folder. After adding them all to your favourites collection, go to edit your bio and click "Add Gallery".
Step 2: Click "Collections", click your stamps collectio