Hi Carolyn,
You should get a reasonable result by plugging the guitar lead into the KN7000 mic socket. I would suggest that you set the guitar volume controls at a low level initially and then increase them gradually, to avoid possible overloading. Adjust the KN7000 mic volume as necessary to achive a suitable level. You can also apply digital effects such as echo, reverb, phasing etc. to the mic channel.
It would not be a good idea to connect the output of an amplifier directly to the KN7000 mic input. The amplifier output level would probably cause severe overloading of the mic input and could possibly cause damage.......

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Willum