I recently bought a Roku device, but I'm finding the features to be very limited. On my home screen, I can only see the home menu, streaming apps, and settings. When I search for channels, I can't find some essential ones! I also tried to install the channels I want from their websites, but they are displayed in grey, making it impossible to add them. Could you please help me?
Where do you live? Depending on where you are, features and apps may be restricted.
In the middle east! However, I used to have all these apps available on amazon firestick previously from same IP address
Roku is not currently officially supported everywhere, which is why you see some issues/restrictions when trying to use in the area you are in. See link.
Customer Order Frequently Asked Questions | Roku
The app providers control where they can be used, not Roku. Since the "Middle East" in general is not a supported location by Roku, many providers also do not permit their apps to be available there. And it doesn't matter if it was available on another device (such as a Fire TV device) as it's all controlled by the content providers, not the platforms themselves.