To assign roles and permissions for your organization, click on 'Team.'

Click on the three dots (⋮) beside a team member's name or email, then assign accordingly.

First, you have to assign a user as either an owner, an admin, or a member.
An owner can invite team members to the organization and edit the settings of the organization.
An admin can only invite team members to the organization, but not edit the settings of the organization.
A member, despite having access to the projects within the organization, has no permission to invite team members and edit the settings of the organization.
Second, you have to assign a user as either a viewer or a creator.
A creator can view, create, edit, delete projects and themes, write comments, and upload sketches and images.
A viewer can only view projects and themes and write comments.