[Link: oneforall.com]

The instructions are online at the website. They also have the manual available to download at the link above.

Reading in the manual, I noticed it gave an example of learning a button from a remote called "Mono / Stereo".
I didn't realize until now that English might not be your 1st language, so you might have gotten confused by the instructions giving an "example" of how to learn a button to the OneForAll remote. The "Mono / Stereo" button was on a remote that they were giving an example of how to learn 'that' button into the OneForAll remote.