Wis. Stat. § 5.79: Instruction of electors.

At polling places where an electronic voting system employing the use of ballots and voting devices is used, the election officials shall offer each elector instruction in the operation of the voting device and ballot before the elector enters the voting booth. No instructions may be given after the elector has entered the voting booth, except as authorized under s. 6.82 (2). All instructions shall be given by election officials in such a manner that they may be observed by other persons in the polling place.