@thessa
Ok first for all, I haven't shopped in that account with real payments (just made an outfit by Credits Daily Spin).
Second i never had any warning related to IMVU, about the email i've put it's random email as i said because it's not even associated to the account (you need to conferm the verify of that email in your own email website that follows the "@").
You can create a character even if you use a random email instead of the real one and it'll keep too long as your own email.
You can change it anytime, just go on Setting → Email (and change it then go to your email website for confirm your changed email).
In the setting you can also change Password, look Payment and Orders (with the related payment system) and etc.
Once you confirmed your email account, you'll be able to enable even Two-Factor Authentication from always Setting → Profile (which is important for the security of your account, the only bored part is go everytime to your email website to check and put the code everytime you log in but you can keep saved it without using the code by pressing "Remember this device" and accept the code you've put - Only for your own device and nothing else, important is that you have the character related to your account with your original email).
and Third yes, now i'll tell you login password so you'll be able to log in.
Thanks for interesting.