Yo Nym. Welcome to the board! Electric guitars are usually recorded using a nifty device called a "microphone". You *can* plug the guitar directly into the interface if it has an instrument input, called high impedence, or high-z. Then you have to use an amp modeler in the computer recording software to simulate the sound of an amp. The third way, as suggested abnove, is to take a line output from the amp (only if it has a line out) to the line in on the interface. Although some folks, including me, have gotten pretty good sounds using modelers, most folks, including me, prefer to use microphones when possible. There are also outboard mic modelers, such as the Line 6 POD, that can plug into the interface line input, or go directly to the computer by USB. Most engineers, as I said, prefer mics. The good news is that even in big time studios, the favored mics for this are often cheap stage mics, such as Shure SM57. For wicked cheap, Behringer XM8500 isn't bad, about $20 brand new. Just get a mic.-Richie