You can collaborate with as many team members as needed on 1stCollab. To add members of your team complete the following steps:
Go to your Brand Settings
Under Contact Information > Other Member Emails add the email address of your team member using their company email address.
Have your team member a new account at 1stcollab.com. Make sure they create an account as a Brand and use their company email address.
Once they've created an account, they should automatically be taken to your Brand Dashboard.
If the new team member is going to be the primary point of contact for the campaign (and the one that completes most of the Tasks), make them the Main Contact for the brand.