Although the need to reclassify botanical names is uncommon for the layman, it is necessary for professional taxonomist.  The actual process of reclassifying a botanical name within the software is simple enough:  select the name to be reclassified and press the button at the bottom of the checklist hierarchy.

On the left-hand half of the reclassify window, select the new parent for the name to be reclassified.  On the right-hand half of the window, select the rank for the name.