To add new workspace members, click "Invite People to Workspace" which you'll find under your workspace name on the top left:
From there, enter the email address of anyone you'd like to invite, or click this link to create an invitation link that can be shared with several people:
Tip: If someone doesn't receive your invite link, please have them check the junk or spam folders, just in case.
Note: Every member in your workspace is also a workspace admin on the Starter plan.
To remove members from your workspace, go to "Manage Members", which you'll find under your workspace name on the top left:
Click the little arrow next to the member you want to remove then, Remove from workspace:
To learn more about how adding or removing members impacts your bill, check out this article.
To leave a workspace, go to "Manage Members", which you'll find under your workspace name on the top left:
Then, click "Leave workspace" under the role dropdown to the right of your name: