MX Simulator

ok so i was tracing difficult pattern is ps when i realized i was using the subtract pen tool instead of the add pen tool is there a way to chance it from subtract to add? if anyone knows please please help because i dont feel like tracing it again thanks.
here is a pic to help understand

thanks
kyle

i have that problem too,
so what i do?
-try one, and if it doesnt works ctrl+z
-try another, f it doesnt works ctrl+z
-try another, f it doesnt works ctrl+z
-at the last one it should do what u want (99.999% sure)

Save the path and just reselect it later.