Question: pgadmin how to create new user?
Answer: Give the role a descriptive name > click 'OK'. ... 
Expand 'Databases' > right-click on the database you would like to connect to Chartio > select 'Properties'.
In the 'Privileges' tab select the newly created group from the 'Role' drop-down menu > check the 'Connect' box > click 'Add/Change' > click 'OK'.