I assume you have already done a proper Forum Search for your model number in case other people have already answered your question ?
If so and that didn't help then check out this thread: https://community.sling.com/message/10363#10363
Come back if it that doesn't help either.
I am completely new to Slingbox and just purchased a Slingbox 500 and went through all the set up quite easily until it came to setting up the remote. I have the LG SH940C-LN Cable Box and it is not listed anywhere which is quite frustrating as I cannot complete the set up. Does anyone have this box and has it working with Slingbox, is there another remote model that can be selected that will emulate this box remote. Need help from the experts to get my box configured and working. Any help gratefully received as it seems impossible to e-mail support for assistance