Sociomata offers many plans with multi user access. In these plans, the administrator of the account can invite and add other team members to collaborate on social media content. 

Once your account has been created, go to Settings from the top-right of the screen.

Within the Settings menu, select Team settings. An option to invite members appear. Type in the email address of the team member and send them an invite. 

The team member will receive an invite similar to this in their email inbox. They need to click on the sign up link and proceed.