players location are stored as transform type(combination of location ,rotation and scale), so make a transform variable in you savegame blueprint
Add an instance of your savegame subclass to the blueprint in which you want to save data.
set the values you need to save in the savegane variable (in your case it’s player transform ,and you can get that by using get player pawn/character function ,then drag another node and choose get actor transform and set it to the savegame variable) and pass that to the Save Game to Slot node