Setting up your profile is easy to do in Glean. Hover over your avatar in the bottom left corner of the left navigation, and click your name ("Your profile") at the top of the menu that appears.
From there, you'll be directed to Your settings > Profile, where you can edit your details like adding your preferred name, pronouns, bios, and any additional links.
Sections that can't be edited come from the system your company has connected to Glean to get people data (e.g. GSuite, Workday, etc.)