I cannot get the mouse to work

[Poutlaw]

Hello , I have had this game for awhile and I am sorry I cant figure out how to get the mouse to work. I am older and dont like to use the keys to move. I think I emailed the developer and he gave me a solution, but I now cant remember it lol .
(hence older player) but I do love this game and would like to play it again ! PS it works in the beginning but after I have left the game and came back the mouse isnt on and I cant make it work even if I push " accept" .