If the member that you would like to change the address for has not yet visited the site, then you can change their email address by going into Home > Site Members. There you will see the option to change their email and to re-invite.
Unfortunately, at this point in time there is no way to change the email address of a member that you have already invited to the site and has visited.
In that case, what you can do, is to request that they log into their profile with the incorrect email address, and their password, and go to the top right under 'MyProfile' and there they can change their registered email address.
I hope that this helps.
Please let me know if you have any more questions.