I noticed that you want to know if it is possible to connect to the Slingbox remotely from Accra, Ghana using a broadband Internet service. You will be able to watch the Slingbox from a remote location if the Internet Viewing was enabled properly as long as you have Internet access. You can check with your Internet provider to see if there are some video streaming restrictions on that area.
Feel free to check the instructions of the following articles in order to enable the Internet Viewing manually:
Also, make sure that your equipment meets the requirements in order to view your Slingbox without any problems.
I hope that helps!
Since you are already watching your Houston SB from other locations in the USA, it seems likely that your SB can stream to anywhere in Internet Land. However, your friend's Internet service in Ghana might not be fast enough to reliably stream your signal. You could test this by setting up a guest viewing account for your SB, then advise your Ghana friends of the guest account and see if they can view your SB stream on their computer.