Add New Collaborators
Go to www.convert.com and login to your account. Now click on Account Settings and then Collaborators.
Now click on "Invite Collaborators" from the top-right corner of the page.
Now it will open a pop-up window. Enter the collaborator’s first name, last name and email address.
Under "Project", select a project and an access level for your collaborator. Each collaborator can have one of four access levels to a project:
Finally, click on "Send Invites". You will be redirected to the "Collaborators" screen and from there you can see your pending invitation list.
If you want to remove your invited collaborators from the list, you can easily do that.
For more information on permission/access levels, please see this article.