Is there a screen in RetroArch that gives all the versions in one place? If not, how can I easily get my version numbers of RA, RP and lr-fba to post
Press Select + X while in game and the RetroArch RGUI should pop up. You can see the RA and emulator's version at the bottom of the screen.
RetroPie version is shown at the top of the dialog when you start the RetroPie setup script from Emulationstation