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No worries, good luck! Also you can try clearing your browser cache though this may log you out of things, do not clear your saved passwords unless you have those backed up elsewhere. Clearing passwords will not be needed so you can leave that box unchecked if you are prompted.
I just saw your other comment that you are on a Mac if clearing browser cache does not work:
https://www.siteground.co.uk/kb/flush-dns-cache-in-mac/ this shows you how on different versions of mac to flush the DNS cache.
Follow it up with your administrator password, letters will not be shown as it is being typed, which can be confusing if you are not used to the terminal.
Also as someone coming from Linux Land, only type anything with sudo privileges if you trust the person giving such advice; sudo runs the command with administrator privileges. These are legit DNS flushing commands and are safe, but make sure you verify such commands.
