mirroring issue on sql server 2008 R2

TITLE: Database Properties
------------------------------

One or more of the server network addresses lacks a fully qualified domain name (FQDN). To start mirroring without using a FQDN, click "Yes." To specify the FQDN, click "No." Then, specify every TCP address by using the syntax for a fully qualified TCP address, and click Start Mirroring again.

This syntax is:
TCP://<computer_name>.<domain_segment>[.<domain_segment>]:<port>

------------------------------
BUTTONS:

&Yes
&No
------------------------------