You mean like the website URL/Name when you enter it.? I'f it is
Step 1 : Go to No-ip.org
Step 2 : Register
Step 3 : Go to Your No-IP
Step 4 : Click Manage hostings
Step 5 : Add a host & Name it what ever you want
Step 6 : Download No-IP
Step 7 : Once you do & You need help comment back