How can i play retro nintendo games like donkey kong jr. on the R4

can someone help me or guide me where can i find that tutorial, thanks

Check out this thread about Emulators for use on the DS.
https://www.romulation.org/forum/index.php?topic=5002.0

Thanks but i have no idea what to do man, well i keep searching

Depends "which" version of the roms your after...the NES versions or the mame versions?Mame is arcade-NES is the original nintendo system.Grab one of them-shove it in the flash cart (the r4 in this case) and place the roms in a "roms" folder-but the emulators have different methods-read the included instructions.

It's best to just take that leap-choose whatever one you desire, read the bundled .txt file.