No can do, as far as I know. You need to get both your roku and the device with the remote app onto the same network for them to work. You'll need to buy or borrow a remote, then your remote app will work.
Hi,
Thanks for the inquiry.
What is the model of your device?
We will try to assist you from there.
Thanks,
Danny
I need to order a new remote for my 2015 sharp tv with Roku on it. It’s a smart tv . Can you give me a number to call to order new remote
I think you would get that from Sharp, but Amazon would be easier:
https://www.amazon.com/sharp-roku-tv-remote/s?k=sharp+roku+tv+remote