@Michellem78
You can only use the Roku mobile app after the Streaming Stick has successfully connected to the network.
In order to connect to the network, you will generally need a physical Roku remote. For the Streaming Stick you need a Roku Voice Remote (RF/wifi remote).
Your Westinghouse house remote is likely an IR remote so will not work with the Streaming Stick. (if you do not see a microphone button on your remote, then it is an IR remote).
You can purchase Roku Voice remotes at Walmart, Target, Best Buy, etc. if you need it immediately. Otherwise, they are available via Roku. https://www.roku.com/products/accessories
Roku Community Streaming Expert
Just another Roku user... I am not a Roku employee.
Insignia RokuTV, Ultra 4660, Premiere+ 3921, Express 4k+ 3941, Streambar 9102