You can get the details you need to create the DHCP reservation (MAC address, IP address, and port that your Slingbox is using) from the network details section of Watch on Slingbox.com or the Network Settings section of Slingplayer for Desktop. To find the network details in Watch on Slingbox.com, select your Slingbox, and go to Settings. In the lower right corner under your Slingbox name, select NETWORK DETAILS.
In Slingplayer for Desktop, select your Slingbox, click Standard View, and select Network Settings.
For help setting up a DHCP reservation, see the link below.
After you have your DHCP reservation working, try to connect from a remote location with Watch on Slingbox.com or SlingPlayer.
You should now be good to go!