Adding of headings
You can add new part of page just click EDIT-link for existing part and type the new part text and heading before or after the editing one.
Try to do this now.
Click me and add headings after
Test heading
text
One more test heading
text
Click me and add heading before
Removing of headings
You can remove any part by calling InPlace Editor for them, deleting all text and saving. We prepare some heading below for you to practice destruction 
If you don't see anything below so somebody already removed them. It's work!
Remove me!
text
Remove me too!
text
And me please!
text
Don't forget about me!
text
Please don't remove me