Thanks man I done it, but I need a perfomance width. I have 900px now, but is to small. What is the perfect width?
And how do I remove the page title in main.tpl or where else?

Hello!
I am new in this cms and I need help. Can someone please help me, how to get an image for header. I have already done the image, but I can't use it. I know, that I must change something in main.tpl and header.php. But I don't know what. Please help me.