You got this :)
to edit the page click on the little edit menu that should pop up below the menus and above the first element on the page (in this case the line above this one)
Click on one of the little grey balloons on the left and a menu will pop up for you to add all sorts of content
You can also drag content around so it is where you want on the page, it is constrained a little by certain sizes e.g. across the whole window, half or quarter etc
When you have finished editing don't forget to click save.
HAVE FUN!! Ask as many questions as you need to and who know we may see a simply divine site in the future! <3