There was a small compromise and now I can't use the old email address. I need to change the old email with a new one and I am not sure how I am supposed to do it, I can't find any settings related to it. Should I contact the support for it, is this support?
On your profile page, you'll find a button to change your email address. To get to your profile - try clicking on your username anywhere on the page.
If you're wondering if the button was there and you didn't notice it - no, I just added it :)
Ah, yeah, I see it now, thanks for adding it!