Absolutely! If you haven't created your account then you would want to go ahead and set up your profile and then change the email address by following the steps below. If the email address you see on the profile set up page doesn't belong to you then it would be best to ask one of the church leaders to send a new email invitation to the correct email address.
If you have already registered you can edit your email address by going to "My Profile" in the top right corner, choosing "My Profile" from the drop down menu, and by typing your new email address over the old one. You will then want to choose "save profile" towards the bottom of the page.