Sorry about this seemingly basic question, but I have looked at the similar questions and those solutions (including Bluehost documentation) hasn't worked for me.

I have a Bluehost account hosting multiple add-on domains. Currently:

1. a.com > Existing wordpress site, located at `public_html/a`
2. b.com > Points to an empty directory at `public_html/b`

All I want to do is change my wordpress site from `a.com` to `b.com`.

I have read answers here, as well as other posts online, that suggest adding:

```
define('WP_HOME','http://b.com');
define('WP_SITEURL','http://b.com');

```

But of course that doesn't work. I don't see how that would work either since when I enter b.com, the server would be looking under folder b/ which is empty. I figure I'm just missing a simple step somewhere.