Real tire mounting lube won't corrode rims. Detergents may or may not, depending on the specifics. I've used straight Dawn dish detergent with no odd results, but now I use the real thing... that brown stuff that looks like grease. It really is slippery stuff.
You need to break the bead, which isn't always easy, then you need to remove the old tire, clean up the sealing surface of the rim, possibly change the valve, mount the new tire with the colored dot in the right place for balance, and with it rotating as the arrows show, then check the mounted tire-wheel for balance and add weights as necessary.
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