There are 2 types of KanBo licenses:
- lite ones - which allow users only to see KanBo and write comments.
To make a user lite, make sure your license covers lite users.
Go to settings -> general to check.
To give the user a lite license, run this query in SQL.
update Users set LicenseType=1 where Name ='Name of user'
Lite users can be recognized by indication in their profiles: