To view the current users in your Workspace you can click on the Users menu item under User Management in Settings.

In this page you can view and remove users from your workspace as well as invite new users. Clicking on the Add Users button should present you with a pop-up to set the new user’s email and optionally a group to which you would like to add the new user.

Opening the user record should show you the details of the user, such as their name, email and timezone.

If you look at your own user record you will be able to update the details of your profile as well as your Owner or Admin access if you already have one of those roles.