The DLNA server built into iHomeServer is enabled by default when you install iHomeServer either in desktop or Windows Service mode.  You can check the status of the DLNA server from the iHomeServer Management Console Home tab at any time under the 'iTunes DLNA Server' feature:

 

 

Therefore with a default installation of iHomeServer, you should already be set to go to access your favorite media from your DLNA compatible devices.

 

If you wish to disable the DLNA server simply click the 'Disable' button next to the DLNA feature.