Installing WordPress for class problems

I will try to give as much information as possible here to hopefully help make sense

I am enrolled in a class at a community college for learning wordpress. I have a textbook WordPress 24-Hour Trainer book for it w/ an instructional disc

web host is hostgator

In week two we are tasked with registering a subdomain to the school’s domain of gatorclass.com. I was to sign up using myname.gatorclass.com
-when signing up i followed the instructions saying that I already own this domain as my school owns it not me
-24h later on thursday i got confirmation email that my account was setup to domain wleiningergator.class.com versus what i though i chose as wleininger.gatorclass.com
=this resulted in when i installed my first wp installation it told me it was unfindable and to go to class.com

i proceeded to work with tech support last night to identify i need to change my subdomain to wleininger.gatorclass.com versus wleiningergator.class.com
*I chose williamleininger1.gatorclass.com
-proceeded to do this
-supposed to be instantaneous change so i could immediately move to a wp installation
–instructed to install wordpress again
=now it’s still not findable
=now when i go to gatorclass.com it shows the directories of folders. I find mine still as wleiningergator/

I simply don’t know what would be causing me being unable to navigate to the page and haven’t been able to get it resolved so far, so I’m asking for advice from the community while i continue to work with tech support.