In the box labeled as :
Username and Password : Now, enter the login username and password that will be used for CPanel, FTP, etc. by the owner of that domain.
Ip Address : Next, if you have any free IP Addresses and wish to assign one to this domain then click the drop down box and choose the IP.
Package :Lastly, in the drop down box across from Package select the package that this domain will be using. The package specifies all the features that will be included in the domain (diskspace, bandwidth, mysql databases, etc.)
>>Once you have entered the designated information click on the button labeled as Create.