HelpHow do I update a game's class?

Any tutorial on how to update classes using ReClass?
I have already searched in so many places I did not find anything that could help me.

Using a dll you can log the base pointer of the class then you double click on the class address in ReClass and you put that logged base pointer.
Then it's all about defining what data types is in the class using the buttons int32, hex32, ...
Don't forget to readd bytes if you're lacking of bytes in ReClass.