I understand that you are having some issues trying to configure your Slingbox for Internet Viewing on your Mac computer, since you cannot locate your Slingbox on your network.
If the Slingbox shows solid lights, the unit is "healthy". This means that the issue is not related to your Slingbox. Most of the times, this issue is related to certain Operating System - web browser version combination. With this in mind, I encourage you to check the following link in order to get all the information about the supported Operating System - web browser versions: