Hi, no problem, as many times as I've used these forums it is nice to be able to pay it forward for once.
I'm a little confused by a few things here but I think have it for you.
1st why the "a href" above, are you trying to have your image link to something? Or have something link to it?
2nd 1519px is pretty huge, my actual content window is only 1000px (I think, not positive) so you might want to resize that.
With that though heres the code you need to put in the text editor.
<div style="background-image:url(http://www.medicalbillsupport.com/wp-content/uploads/2013/08/Man-Lost-in-Maze-with-captions.png);background-repeat:no-repeat;height:1519px;width:1519px;margin-top:20px;"><p style="text-align: center;font-size: 100px;">Let us help you save money!</p></div>
You will need to do a few things though, 1st I could center the text horizontally on the image but could not figure how to center vertically. The only way I thought of was to hit enter before the "let us..." part several times till it got right. So you will need to do that till you get it where you want it, maybe start with 5 times. Thats just a little trial and error on your end. 2nd I guessed at a font size for you. You can change it easy enough where it says font size. 3rd if you do resize the image don't forget to resize in the code where it says 1519 to whatever you resize it to. Finally the font will be whatever default font you have for posts but if you want a different one, just insert "font-family:Arial;" (replacing arial with your choosen font) before "font-size."
Hope this does the trick!
all the best