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 got a slingbox today and everything set up smoothly except finding the right remote. We have RCN cable in Chicago (digital, including hd channels) with a Tivo Premiere HD but none of the remotes that looked similar that I tried work. Any help would be greatly appreciated.