I figured out a way without using SSH and all that stuff, hope this helps some of you out there! 
Requirements:
- an iPhone (jailbroken)
- a Computer
- roughly 10mb of 3G data on your phone, or a wifi connection
Steps:
1) Open Cydia
2) Go to Manage > Sources
3) Tap Edit, and then Add
4) type in http://cydia.xsellize.com
5) inside the new xsellize Source, you will find "NES", "NES ADX", "NES.emu" and "nes4iphone" - install one of those, they are the emulators.
(I prefer nes4iphone, it's the fastest)
6) You may also install a NES ROM pack, and other emulators as well (N64, Genesis, Gameboy, SuperNES - just search for them by looking around or tapping on search)
7) Download and install iPhone Explorer to your computer, install and run it. (close itunes)
8) go into Root Directory > var > mobile > Media > ROMs
9) here you will find all the folders for your roms, depending on what emulators you have. simply drag the ROMs you want into these folders.
10) Enjoy
Requirements:
- an iPhone (jailbroken)
- a Computer
- roughly 10mb of 3G data on your phone, or a wifi connection
Steps:
1) Open Cydia
2) Go to Manage > Sources
3) Tap Edit, and then Add
4) type in http://cydia.xsellize.com
5) inside the new xsellize Source, you will find "NES", "NES ADX", "NES.emu" and "nes4iphone" - install one of those, they are the emulators.
(I prefer nes4iphone, it's the fastest)
6) You may also install a NES ROM pack, and other emulators as well (N64, Genesis, Gameboy, SuperNES - just search for them by looking around or tapping on search)
7) Download and install iPhone Explorer to your computer, install and run it. (close itunes)
8) go into Root Directory > var > mobile > Media > ROMs
9) here you will find all the folders for your roms, depending on what emulators you have. simply drag the ROMs you want into these folders.
10) Enjoy