Sorry you're stuck but there's almost always a pretty easy fix! Do NOT try to start all over again, eg. uninstall Max's Pitch Package, etc. That can make things worse.
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explain the problem clearly
My Meeting ID's are Labeled Mtd-01 instead of Mtg-01. I went to the <setup><object & fields><Obj Mgr><Meeting> and then <edit>. I correct the display format to "Mtg-{00}. However, the system stated it would only apply to records going forward and existing records would remain. It there a way to update the existing records to Mtg-{00}?
I don't think there's any way to change those once they are set, other than deleting the whole Meeting object and that would take a ton of work to get back to where you were. But it's ok like you've done it. That part doesn't really matter -- it won't affect anything in the exercises anyway and you shouldn't lose any points. I wouldn't worry about it if I were you.