NEdit

I read up on macros but I am still not understanding how to write them.  I looked at the included macros and have no clue.

I need a suggestion on how to change "teh" to "the" and "adn" to "and" and "wiht" to "with", etc with one macro.  I would be using it a LOT.
Please show me how to change 2 of the finger faults and I'll add the others as I need them.

Is there a "tutorial" on them or something close?
Thanks