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What is "Changing Cover"?
I saw that in the androids' passive, saying they would absorb ki attacks when "changing cover" for the first time, but i don't know what it means
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When you are being attacked by an opponent, you can switch characters to let another character take the damage from the opponents' combo. This changing of characters is called either "substitution" or "cover change."
So pretty much what Trentmillenium said.
The idea behind this is that, certain units like Piccolo SP and SSJ Trunks SP, have a damage reduction when substituted during a combo so you can basically tank the entire combo if you time the substitutions right.