The simplest way is in-game: press the '`' key (this may be a bit awkward

The simplest way is in-game: press the '~' key (this may be a bit awkward

After defining such a macro, you should test it. Saving of all macros is 
done with the '~' command.

After defining such a macro, you should test it. Saving of all macros
and keymaps is done with the '~' command (use s to save macros at the
prompt).