Team Members within Gather are comprised of "Clients" and "Associates" (link here: Adding Clients). We think of associates as members of your internal team such as project managers, assistant designers, project coordinators, etc.
Associates have all the same permissions as the "Owner" on the account. The only differences are they are not able to access the billing section of the account, and they are not able to add Team Members to the account.
Just follow the steps below...
Step 1: Click the "Account" drop-down menu in the upper right-hand corner of the page and click "Company Profile".
Step 2: From your "Company Profile" page, click on "Team Members" and then click the green plus.
Step 3: A window will then pop up asking you to enter in your associate's name and email address. You will also need to select the project(s) you would like them to have access to or select "All Projects". Don't forget to select a "Member Role" and then click the green "invite" button.
Step 4: Your associate will now receive an email like the example below. Once they have accepted the invitation, they will be instructed to create a Login and Password. They will use these same credentials to log in from now on.