The Users tab is the roster: who's on the account, what they can reach, and how many of your plan's seats you've spent.
1
Reading the roster
Each row carries the person, their roles and their teams, and expanding one shows the detail underneath — when they last signed in, whether they've confirmed their email, and whether they've actually accepted their invitation yet. The counter beside the Users tab is your plan's seat allowance: it reads used / included, turns amber as you approach the limit and red once you're on it, and at that point Add User stops working until you upgrade. On a plan with no seat limit the counter simply isn't there.
2
Changing someone after the fact
The menu at the end of a row is where the rest lives. Edit User changes their name, phone, roles and teams — everything except the email. Reset Password sends them a fresh one rather than showing you anything, so you never hold a colleague's password. Logout from active sessions is the one to reach for when a laptop goes missing or someone leaves: it kills every session that person has open, everywhere, at once, and they'll need to sign in again. It doesn't change their access — it just ends what's currently open.
3
Removing someone
Remove User takes a person off the account, and it takes effect immediately — whatever they had open stops working on their very next click, without waiting for a session to expire. Treat it as final: a removed person disappears from the roster completely, and there's no undo and no archive to fish them back out of, so bringing them back means inviting them again from scratch. There's a quieter way to do the same thing by accident — the Active checkbox inside Edit User. Unchecking it and saving has the same effect as removing them, but arrives without the confirmation step that Remove User gives you. If you only mean to pause someone's access for a while, there isn't a setting for that — removing and re-inviting is the honest path.