Thank you for posting to the forums! I understand you are trying to setup Internet viewing for the Slingbox Solo, I would be happy to help with that! To manually adjust the router settings for the Slingbox you will need to access the router home page. There are guides to many different models of router that can be found on portforward.com. The port forwarding guide will walk you through port forwarding the router step by step.
Here are some links that may be of assistance:
Hope this helps!
The Sling Moderation Team - Leanne