You can with that. Go into the main menu and find Streaming Channels to select and add them.
@Nick2 wrote:
I own a model 4630X Roku box. Do I need to buy a streaming device to stream channels or can I get them with the box I have?
The 4630 is the Premiere+. It is a supported model (just not the latest version) and supports all available Roku channels. As @dgrace mentioned, just choose the channels you'd like from the channel store on the player, or log into your account on the Roku web site and search for channels there.