If you are already a workspace admin, you can add additional teammates as workspace admins. This will grant them admin privileges to the workspace and all teams within it.
To access the Workspace Users page:
Navigate to the Workspace where you want to add the admin. To do so, go to the Landing page, locate the workspace, and select the three vertical dots next to the workspace name. Then select "Manage Workspace".
Next, select "Users" on the left side menu.
From this page you can invite a new user using the "Invite Admin" button and entering their email address. Or, if the user already has limited rights in the workspace or teams, you can select their name from the user list and then grant them "Workspace Admin" privileges.
Note that Workspace Admins will automatically be granted Admin privileges for the workspace and all teams within the workspace.