To add a new tab, you will have to sign in with Bentley account if you are not logged in yet.
In the first step integration asks to select a Connected project. You can choose to make your selection default so that you do not have to search for the same project when adding more tabs:
Next choose a service:
If you select ProjectWise Web Connections then you will be asked to select a connection:
In this step you can choose to mark this tab as default tab for this ProjectWise Web connection. When a default tab is set, users will be able to create links to document of folders in this tab from ProjectWise Explorer or ProjectWise Web applications.