First you need the banner (see below to find out) if you have new stile blogger its easy you go to new post then template and you will see the name of you blog and a few other things for ectsaple Bits and Bridles Bannery any way click edit its opeste the name of your blog then you will see a box pop up it will say add a imege click that find your banner wait for it to load then save changes. Now old stile bloggers a bit harder you have to post the banner then put it on HTML mode copy all the html go to template and paste the html there then go to the botom of the page and click on privew if you like it save changes if you dont move the html up or down when its ok save template you can also clear edits
How to put a banner on your blog
Well you fist have to have the banner on your pics in the files if you dont know how to this you right click on the banner and save pic as..... then you go new post and click on the simble of the pic on the bar with loads of fonts and stuff like that then you browse pics tell you find the banner then you double click on it it will take a while to load then you just click done and youve got one