ah, you are completely new, ok...
Entering the offset into probe basic is fairly intuitive, you double click in the tool table and enter the offset value, press enter. now the table must be saved and reloaded via the buttons at the bottom of the tool table.
As for learning cnc in general, that is a topic best learned from reading and watching youtube videos of which there are many that would be easier than someone custom typing up a manual. give youtube a search for the specific items you are unsure of.