difficulties

S'hello!  It's way too late for this girl to be awake on a school night but I must be honest and say that I've gotten bored with the way my blog looked for so long.  So, I decided to mess around with it....2 hours later, here we are.  One, ok maybe two collages created in Picasa and still no header to show for it.  If any of you (ahem, Callie) are savvy with this blogger thing, can you help me?  I want the picture above to be bigger...preferably covering the whole header area.  And I want the text to be on top.  Can someone tell me how to do that?

xoxo