batodon1911 do you not have it connected to any network at all ? if not do you copy roms onto a usb and than use F1 to copy/paste ? if you are using PI you can just as well get the SD card out or the actual USB and copy on your PC. Check this: BZZ and consequently this: BZZ .
EDIT: There is also the WIKI: https://batocera.org/wiki/doku.php?id=en:add_games :
Batocera is distributed with some free roms. If you want to add roms, you have several possibilities :
add them from a different computer while Batocera is running, through the network
directly add files on the sdcard/usb key if your host OS supports ext4 (i.e. if you are using Linux as your host OS, if you are using Windows you should add an ext4 driver with one of the modules listed on this page.
use an external USB key to store roms - this external USB key can be formatted in FAT32 to be read under Linux, Windows and MacOS.
use a nas to store roms, and add the roms to the nas
On PC x86, open a file explorer via the F1 key and copy and paste files from an other disk
From a different computer, through the network
To add rom files, you have to connect to your Batocera from a differnt computer on the same network :
from your computer directory (or finder on mac os x), browse the network
find BATOCERA (or you can directly type \\BATOCERA (under Windows or MacOS) or smb://BATOCERA.local (under Linux))
add roms into the /roms directory, in their respective system folders (i.e. /roms/nes for NES roms)
Directly on the SD card or USB key
Once your SD card / USB drive is mounted (see the link above if you have issues accessing ext4 partitions under Windows), copy and paste the rom files into their respective systems folders (i.e. /roms/nes for NES roms).
External usb key
Same as with a SD card, except that you can use FAT32 as the partition format to have access under all major Operating Systems.
Nas usage is described in a specific section : Store games on a nas.