Gaming How do I view the on-screen manual of OSM-enabled PS1 games using Adrenaline's PS1 emulator?

[t33st33r]

I installed PS1 games in my PsVITA. Some games of those ones contain an OSM.
I'd like to view the OSM but I am not able to find the way to do so: I have checked the menu and I don't see a single option to view the OSM.
I don't know what I am doing wrong. Do I need to press some keycombo? Do I need a plugin to enable this feature?

Thanks in advance.