TrialKit requires that every user have two roles:

If you are accessing any item from the menu shown below, be aware that this only affects users at the account level and has nothing to do with their role in a specific study within that account. 

Important: Do NOT use these pages to setup study roles, like Coordinator, Monitor, Investigator, etc. See the links above for the proper steps.

Normally, roles and rights at the host level do not need to be altered. However, if you wish to create additional roles with custom permissions, read here.