I'm a new user of godaddy and never run a website before.
when I click to manage my Wordpress hosting, it shows bad gateway
please tell me how to deal?
Does that happen when you're trying to launch your WordPress admin panel, or when you're trying to view your WordPress site?
If it's when you try to launch your WordPress admin panel, that sounds like a temporary issue with GoDaddy's servers.
If it's when you're tying to visit your WordPress site, that's a harder thing to diagnose over the forum!