It’s probably a scam.
Y'ALL.
I don’t see what is undecipherable. Basically you don’t want anything that isn’t a letter or number and you must keep it case sensitive.
Basically, it sounds like they’re doing this pre-sale the smart way. One of the problems that these online pre-sales used to see quite often was that they’d pick some basic password and distribute it to all members of the club. Well, these passwords would leak out onto the net, and thus everyone could access the pre-sale, not just the club members.
What they’re saying here is that when you go to buy the ticket you’ll need to have your fan club username and password handy. This makes sure that outsiders aren’t buying the tickets. If your username or password contains non-alphanumeric elements (in other words, symbols like @, !, etc.), then you need to remove those and type the username or password exactly like it would appear if that element never existed (in other words, don’t leave a space when you remove the offending symbol). For example, if your password is Obamaisan@ss, then you enter the password as Obamaisanss, not Obamaisan ss or anything else.