Hello ORVATSEL welcome to FF..
On the upper right-hand side of where the presets are there is a little arrow...If you click on that there will be a sub-menu that pops up...First select the preset that you want to edit...Then click on that arrow for the menu then choose "add preset"
This will give you a copy of that preset but you can now edit that....
So now choose the preset this process created and start editing..Moving the sliders and all that.....Once you are done and got it the way you like you can go back to that sub-menu and choose "Update Preset" and it will update that preset with the new settings.....Make sure that you have your newly created preset selected otherwise it won't update....
Stupid things happen to computers for stupid reasons at stupid times!