How to Add Users to a Project in WP Project Manager
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Hover your cursor on a project. Click the three-dot icon once you see it.

A sidebar will open up. Scrolling down the tab, come to the Team Members section.
Type your desired team member's name in the search box. Once you see him/her, click on the name. This will add the user to the project as a team member.
Next, you can assign him/her a role for the project. When everything is done, save all changes by clicking the Update Project button.

Thus, you can add new team members at any time while a project is ongoing.
