The installation seems to be successful. I can go to the subdomain and I see a Wordpress installation. The theme seems to be messed up. However when I try to login by going to the provided URL or going to the Manage Applications page and clicking Login, I get a 404 error.
Hi @joshd. Welcome to GoDaddy Community! I've never seen that error before. Since it's a 404 error, I'd guess that either there's a problem with something within the WordPress install or maybe the domain in question isn't actually pointing toward the hosting plan. If you can share the domain of the site, that may help others suggest solutions for you.
JesseW - GoDaddy | Community Manager | 24/7 support available at x.co/247support | Remember to choose a solution and give kudos.