Drobo

Drobo 5N & Wordpress Issue

I have a Drobo 5N and I have installed wordpress. Some how I did something that corrupted my wordpress install. I uninstalled wordpress and then installed it again. It appears that the previous accounts and themes are still there and were not removed from the uninstall.

How can I completely remove everything from wordpress so I can reinstall it as if it was for the first time?

Thank you.