Please follow the below mentioned steps to assign the role:
Step 1 : In the left tool bar, Click on All users .
Step 2 : Click on Roles & Permissions >> Add Role.
Step 3 : Enter the Role name. Let’s say, Sales man, Accountants, Staff etc.
Step 4 : Enable the permissions, you would like to give the access for the user.
Step 5 : Click on Add Role.
The added role, will show under the Roles & Permissions.
If you would like to make changes, in the permissions. Click on Edit and make changes.