In the movie, three magazine writers (Jeff, Darius and Arnau) investigate a person who placed an ad in a Seattle magazine that said:
"Wanted: Somebody to go back in time with me. This is not a joke. P.O. Box 91 Ocean View, WA 99393. You'll get paid after we get back. Must bring your own weapons. Safety not guaranteed. I have only done this once before."
Thinking the guy is a crack pot and would make some good reading, they track him down. The time traveler's name is Kenneth and he is a clerk at the local grocery store. The perfect cover! Kenneth is convinced that secert agents are tracking his every move but he gives his trust to Darius, who he feels is a good time travelling candidate. He gives her training execises, I guess to get her in time-travelling shape, whatever that is.
Kenneth's mission is to travel back in time to prevent the death of his girlfriend. Obviously he didn't watch The Butterfly Effect because traveling back in time never turns out very well. Does this guy have a real time machine? Is he just a nutbag who has ingested too much red 40? Guess you'll just have to find out.