either way, installer or SSH i just don't know how to do it
if someone could explain.
1st install the NES application using the installer then it depends on the method you want to use to install the ROMs.
I have heard that you can use the installer to load ROMs but I haven't tried so the method that I use is iBrickr if you are using a PC. You have to create a folder in var/root/media/ called ROMs. After you create it this is where you will put the actual ROM file. There is a bunch of places that you can find ROMs out there just do a search on Yahoo.
One of the problems that I had at first was making sure that the file extension was .nes. The first few that I tried weren't so the App wouldn't recognize them.
Good Luck let me know if you have any more questions.