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.
Thanks for your speedy reply.
I have checked the Forums with no success for an answer to the missing remote control for a (UK) Manhattan Plaza HD-T2 Freeview set top box. Actually someone else asked the same question some months ago. I assume with no success either ! If you can not provide an answer the i will have to try and get my money back on this useless device.