First go to http://domains.tierrahosting.com
To search for domains you need to click on the Home tab. This takes you to the Domains home page. On this page, you can search for a match to a single word or combination of words, and you can search with or without the TLD extension. Domain names can be between 3 and 61 characters long. This does not include the TLD extension, such as .com.
Enter your search word in the text field, and click Find.
The search results indicate whether the domain name is available. If an exact match is found, you will see a large checkmark and the word Success! next to the name. The results page also lists other similar domain names and any Premium Domain Names that are available.