Welcome to the Magix user to user forums, so not a contact for any Magix staff and the website is not ours.
Hence, I doubt whether anyone who posts here will be able to help you, but why not post screenshots of what you see when you attempt to access your website, making sure you hide or obscure any confidential login details?
. . . . How can I access my website to update it? You website looks totally different from when I last logged in . . . .
Are you referring to Magix Online free hosting that now looks like this
where you used Website Maker Deluxe to create the site online?
If so then the online design software and editing feature has not been supported for approximately 3 years and in 2016/17 you should have been notified that the software was no longer supported and was being dropped.