The word “mistype” exists, so given modern touch-screen technology, “mistouch” sounds good to me, even if that word does not yet exist. Nanren’s options are all good as well. Another option, if you’re looking for a noun, might be “fat-fingers” or “fat-finger syndrome”. Check out this article in the MacMillan Dictionary: https://www.macmillandictionary.com/us/buzzword/entries/fat-finger-syndrome.html

I'm not sure that we have as neat an expression. I clicked the wrong option. I had finger trouble; selected the wrong one. I accidentally selected the wrong one. . My hand slipped and the wrong option was selected. I selected the wrong option by accident, just a slip of the hand.