Book Direct triggered email

I have a triggered message to go out after checkout saying, "next time book direct" and at the end it has {MYURL}.  I understand that it's supposed to be my website, but it's showing up blank.  How do I correct this?  All the other areas where info automatically fills in works.  Just not this one.  How do I correct this?

Hi Celia,

I've tested this merge field and it appears to be functioning correctly on my test account.

Could you write into the help desk (help@ownerreservations.com) with a specific example of an email message that didn't include your website URL?