What do you mean by "I went to blackberry site expecting to have a MyBlackBerry Account". What site? And what do you mean by "MyBlackBerry Account"?
If you "attached two email accounts to [your] blackberry", that goes through the carrier BIS which is attached to the RIM servers. For Verizon, that site is https://bis.na.blackberry.com/html?brand=vzw&locale=en
The email addresses probably were set up on the device via the Email Settings "thick client" which basically is a mobile version of the carrier BIS.
Setting up email addresses to be pushed to your device has nothing to do with any other site or any other account such as a "MyBlackBerry" account. If you want such an account, you probably just need to set it up separately.