You didnt mention your Roku model # or firmware version (Settings/System/About) or app version (highlight the app and press Options (*) on the remote).
You have to be signed into the RedBox app in order to see My Library.
If you are signed in and still unable to see it, reinstall RedBox:
1) Remove the RedBox app (Highlight the app, press the Options (*) button on the remote, then Remove)
2) RESTART the Roku (Settings/System/System restart/Restart) <-- MUST DO THIS HERE!!!
3) Re-install the RedBox app
(If you dont restart after removal, settings/cached data associated with the app are left behind and it wont be a clean re-install)
