Within Teamwork Projects, you can choose to add a user as a site administrator.
A site admin will have the same permissions as a site owner and can perform all the same actions.
To change a user to a site admin, click the People section at the top of your site.
You will be presented with a list of people who are added to the site. To the far right of the person you want to make a site admin you will see a pencil icon, select this to edit their profile.
You can then choose the Permissions tab and the option for Is this user an administrator can be toggled on and off.
Note: When you toggle this on, the permissions that were previously shown will now be removed as they will automatically have these as an administrator.
You can then see who is a site admin on the list of people. They will be indicated with a green key icon.
For more information, see: Project administrators