Plutonium

i wanted to delete t4 because i dont play anymore and dont need it downloaded and would like the space back but i cannot find out how to delete the game. i deleted all the folders for the game where i installed it but it didnt do anything, is there any more that i need to do or is that it and im done? and how do i get the space because the game is around over 10gb i think and i could get some other games using that space