This is very uncomfortable for you to change the image of header or change the size.
So now i will lead you how to improve this , and you can "add a page element" at header.
Ok very simple guys, follow this:
1st whatever you want , of course go to blogger.com and sign in your account---->Layout--->Edit HTML
Now press Ctr F and type the word : maxwidget
then you will see the code like this:
<b:section class='header' id='header' maxwidgets='1' showaddelement='no'>
<b:widget id='Header1' locked='true' title='Zenplate Blogger (Header)' type='Header'/>
Most templates have codes like that, it can be a little different from me but not much.
I will explain the red code now :
-Do you see the number "1" ? You have to change that number into any other numbers , for example ,change 1 to 2.
-The code "no" , this is the reason why it does not allow the "Add a page Element" to appear, so you have to change it into "yes"
-The code "true", if you want to delete the header,when you change it into "false" you can delete your header.
Finally, your code will be looked like this after fixxing:
<b:section class='header' id='header' maxwidgets='2' showaddelement='yes'>
<b:widget id='Header1' locked='false' title='Zenplate Blogger (Header)' type='Header'/>
Easy right ? please send my post to your friends and 4rums care this problem.
Thank you very much.
Good luck to you