Go to Manage Projects and then click the Add Project button to begin and go through each step.
Step 1: Make sure that every field is filled in. If the Project Group field is empty you can create a new group by clicking on the green (+) button next to it.
Step 2: Install the applications that you want to use by clicking the green install button to the left of each application.
Step 3: Invite users by entering each person's email into the field provided. Then be sure to click the green (+) button after entering each e-mail address to ensure that they will be sent an invitation e-mail. To make looking-up e-mails easier you can sync your gmail contacts by clicking on the Google Accounts button. Finally, you can include a custom message to be attached with each invitation e-mail sent out.