Responses to things such as Registration Acknowledgement and Lost your Password requests are automated, and come from rehearsalfiles (at) johnfletchermusic.org, with a Reply-To my personal address: john_fletcher (at) mac.com. Unless your email program knows about these addresses, it may put these responses into your spam/junk mailbox, or even delete them unread. So do check in all your mailboxes if it doesn’t arrive in your In-Box.
It may help to add my name and email address to your Contacts.
Also check that I have your correct email address: choose YOUR ACCOUNT>EDIT YOUR PROFILE, where you can amend it if it is incorrect.