if you are playing on PC, than if you hover your mouse over your save and press the delete key on your keyboard then the game will ask if you want to delete that save. I'm pretty sure this is an in-built feature of Renpy so for future reference this should work with all games built in it.
oh that's cool, i always wanted to delete saves where i saved in the wrong spot (like the line below) and had to pay attention so i would save over that one when i got there lol imagine saving in the one before, leaving and then forgetting about it, loading the wrong save and needing to do it again haha