Instructions apply to the mobile version of Instagram oniOSorAndroid.
It helps you instantly share those more intimate things with just the users you consider closest to you.
Tap yourprofile picturein the bottom-right of the screen.

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Select themenubutton in the top-right corner.
SelectClose Friendsfrom the vertical menu.
You should see a list of suggested users to add to your Close Friends list.

To include someone in the list, tap theboxnext to them, or chooseAddif you see that button.
Users don’t know when you add or remove them from your list.
Close friends see a green ring instead of a pink ring.
The green ring is the only way a user can tell they’re a Close Friend.