An easier way to grab the item: Click any empty spot to the right or left of it.
To show this, I've added yellow boxes to the outline below. If you wanted to move Item 1a, you could click anywhere in those yellow areas (which aren't visible in Radio Userland) and hold your mouse down, dragging the item to a new location.
I found this tip in Matt Neuberg's book Frontier: The Definitive Guide, which is available for free online. Though it documents Frontier 4.2.3 for the Macintosh, the book can be useful for Radio Userland users who want to learn how to write scripts and make use of the Radio Userland interface and database, because Radio Userland shares so much in common with Frontier.