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You can find an example here: XLR to 1/4 inch with Transformer
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Since your guitar amp is set up more for a high impedance signal and the SM-58 is a low impedance mic, you will probably get better results with a cable with a built in transformer to boost the signal.
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The cable you need has an XLR female plug on one end and a 1/4 inch TS plug on the other end. All you really need to make it work is the correct cable to plug into your 1/4 inch jack and mic. If you want to connect a Shure dynamic mic (does not need phantom power) such as an SM58, SM57, Beta 58, PG58 etc. If you happen to also need a small mixer, you can get one of those instead of the mic pre and use the mic pres in the mixer. The mic pre will also enable you to plug your microphone into just about anything. That will give you the best sound out of the amp as well as protecting the amp and microphone from accidental damage.
#Do plug in wifi amplifiers work full
The mic preamp has a 1/4-inch output like a guitar, so that you can plug it into the guitar amp like you would a guitar, and the mic pre has an output gain knob that will enable you to feed a guitar-level signal into the amp, which is going to be just a little bit of gain, not the full line-level that the mic pre can give out. That will give you better results for your $99 than an SM58 plugged directly into a guitar amp. If that blows your budget, buy the mic preamp and then buy a $59 microphone instead of the SM58. So if you are buying a brand new SM58 ($99) then also buy a small microphone preamp ($40) for it, like this one: You can think of the preamp like a 1-channel mixer.