The unit looks pretty cut and dry. Wire your turbo85 ehternet cord to one of the 4 common ports on the actiontec router...plug in the power to the turbo 85. Now go to the remote location where the directtv dvr is located...Power up the trubo85 and wire the ethernet cord from the unit to the dvr.
If your dvr still cannot see the network, can you run a cord directly to the modem to make sure there is no issue with the Dvr? Or better yet, can you plug a laptop or computer in the remote location?
I presume this is your product?
http://images.dsisystemsinc.com/WebsiteImages/HPTURBOWALL.pdf