Whenever click on a replay it opens toribash and brings me to the menu

try to put the downloaded replay into "Toribash->Replays" folder and then open Toribash Game, go to "Replays" and find the one that you need

I have a Mac as well. Double clicking the replay doesn't always work but it sometimes does and the replay is playing behind the menu. Just put it in your replays folder and find it like shevaroller says.

I believe the source is... Users > InsertYourAccountName > Applications > Toribash > Replays