NOT VOTING is voting to hand your power over, to throw it away and give it to somebody whose interests are going to be harmful to your own.
REGISTER! Today (Tuesday, April 25th is the close of regular voter registration for the Special Election. You must complete, sign, and mail your Montana Voter Registration form and have it postmarked by this date. After Tuesday you will have to go to your county elections site to register.
Request an absentee ballot. if that''s easier for you.