While acoustic guitars are certainly not meant to be played through electric amps, you still can do it. To play an acoustic guitar through an electric amplifier you'll have to do a little bit of tweaking. By adjusting the tone and volume knobs properly, you can make an acoustic guitar sound pretty good through an electric amp.
Turn the volume on the guitar and amplifier all the way down to prevent feedback.
Plug one end of the 1/4-inch guitar cable into your acoustic guitar. Plug the other end into the 1/4-inch input on the amp.
Turn on the amplifier.
Set the amp to the clean channel. Do not use the gain channel if your amp has one.
Slowly turn the volume knob up on the amp until you reach a comfortable level that does not produce feedback.
Adjust the treble, mid, and low tone knobs until you get a good balance of each. Do not set any one of the tone knobs too much higher or lower than the others.
Invest in an acoustic amplifier if you need to amplify your acoustic guitar on a regular basis. Electric guitar amps are not designed for acoustic guitars.
Do not turn your volume up too high. Acoustic guitar feedback produces a very unpleasant hum.