I am getting error on my site datadase error.

A database error typically indicates that your database application is not running. The steps listed in our database troubleshooting guide should be helpful for determining the cause of this issue. If you'd like to go through with reinstalling Wordpress, you can do so by following this guide or by deploying a Wordpress One-Click App on a new Linode.

Can you tell me how to delete old wordpress and install new wordpress on current linode.