Step 1

Login to our sub-user creation domain management control panel
Here: https://secure.namesarecheap.com/domain_sub_user.pl

Step 2

Click 'Profile'
Click 'Create/Manage a Sub-user'

Step 3

Type new <username> and new <password> for the sub-user
Manage permission by checking 'YES' or 'NO' from Name Servers to Technical Contact

Click 'Save Configuration'