Step 1: Click on the project card that you want to add your team members to.
Step 2: Then click on project settings on the left bottom corner.
Step 3: Then click on the "Add Members" button on the right of the page.
Step 4: On the Add members page you can add new users or add existing users to a specific project.
New Users: Enter the user's email in the email field and then click the "Add Members" button.
Existing Company Users: Check the box next to their name to add them. If the box is checked blue they have been added to the project.