On the main page users can create a sub-domain right off the bad. Simple enter the sub-domain that is wanted or needed and select the main domain name it will reside under, then hit add.
Once a sub-domain name has been setup a user can then chose from three different options.
Setup Redirect: This will allow a user to setup another link for the sub-domain to direct users to. This is useful if a user wants a short URL to something that has a long URL.
Remove Redirect: This will simple remove the redirect allocated to that sub-domain.
Delete: This will delete the selected sub-domain.