When I want to place a staple in the middle of a page and don't have a long reach stapler, I do this:

1. Remove one individual staple and press it on the area you want to staple (prongs facing downward). You will see 2 impressions of the prongs.
2. Poke 2 holes in the prong impressions.
3. Push the staple through the holes and bend with your fingers. Most staples will bend easily.
4. Make the staple ends flush by pressing a flat object against the staple prongs.