There should be a contraint here, if it didn't show it in the tutorial the tutorial writer probably skipped ahead on it Just select the top two rows of vertixes, right click and hold on your model to then click object mode, select the object you want to attach it to and select point to surface under nConstraints.
I personally loved the F8 to F12 shortcuts for component modes so much that when I tried to apply this the first time I kept switching mode till I realised I needed to switch to select both and not undo my selection when switching!