If I remember correctly... I thought that dtregister automatically placed the event registration button in the description article for j1.5, is this functionality scrapped for 1.7?
Is there an equivalent to it available? I really liked that feature!
Check to see that you have installed and enabled your plug-ins, specifically DT Register EventLink. When you install them, they are not enabled by default to allow you to get things setup, before you turn things on. You will need to go into the Plugin Manager and enable it.