Editor just about empty – page full

Hi!

I’m new to wordpress, and taking over someone else’s design.

When I’m in wordpress, and I’m looking at the homepage, it has a header, footer, bunch of images etc… when I click edit page, in the editor there is only one line of text (a quote displaying on the homepage).

This is the site http://zoe-skool.org/ and in the editor it only has ““I came that they may have and enjoy life, and have it in abundance (to the full, till it overflows)” John 10:10

Zoë School aims to support children from Heidelberg and surrounding areas who have additional scholastic needs.”

How do I edit all the other parts of the page??