If you are the administrator of the collection, you can change the positioning of any Entry within a given person's or family's collection page.
Simply left click and hold on the three line icon to the right side of the Entry and drag the Entry to the position in the collection you wish for it to be.
It can be a bit finicky to drag an Entry to the first position under a Chapter that has no other Entries, so if you're having difficulty here are two options:
a) as you place the Entry into it's "drop in" template, slide it a bit to the right before releasing the mouse. or
b) simply add a "dummy" entry (i.e. no linked albums) to that Chapter first and it should be easier. You can then delete the dummy Entry.