Can I create separate users for my staff or marketing agency personnel?

Yes, you can create users and assign them roles based on access you want to provide them to your account. User management is available from Business->Users. Please note the following:

• For multi-site accounts, users are assigned to the site that is selected (top right) while creating the user.
• Users cannot share an email address or a mobile#.
• When a user is activated, an email is sent to his/her email address with instructions to complete the activation step. 
• Valid mobile# is needed to inform the user about alerts and to carry out 1-1 conversations with customers (applicable to Colligso TextIn).

See also: 

• What is Account User Role?