Here is the Syfy channel activation guide to help you

Let us help you to activate the Syfy channel. Syfy.com/roku, this is the portal to visit. Add the channel on Roku as the initial step. Tap on the channel icon; proceed with the onscreen guide to find the Syfy channel activation code. Now type the code navigating to the portal, syfy.com/roku.

 Dail the support number and wait for the response +1-844-489-7600