deleting records

i'm using template, the mini crm... was trying to figure out how to add first and last name to lead owner, by changing the script...
First problem was that i couldn't save any changes to the script because of the numbers, 2451 and 2457, i would get an error saying that other characters were expected...i eventually put letters in front.
then i tried to changes the values of the lead owner...i didn't work and i now have to extra records in my sale owners table, and i can't delete them, says an error occurs.
no idea what to do!
dave