Multple Hacks in MyHacks.php?

hi. i’ve successfully installed a hack on my blog. how do i go about adding more hacks? i’ve tried doing it by inserting the code in the myhacks.php. after i do this though, i always get errors on my page of all sorts. i’m assuming that i really dont know how to add more than one hack code. the wiki documents only show u to insert the code between the <?php and ?>. what about if i add another code? thanks for helping.
Eleni