D-Link DIR-605L User Manual page 66

Section 7 - Changing the Computer Name and Joining a Workgroup
3. Click the Computer Name tab in the System Properties window and
enter a description of your computer in the textbox. When you are
finished, click the Change button.
4. Go to the Computer Name/Domain Changes window and
click the radio button next to the Workgroup you want to join.
When you are finished, click the OK button.
D-Link DIR-605L User Manual 62