Re: How enlarge my header image!
First: DO NOT POST THE SAME QUESTION MORE THAN ONCE IN A FORUM. If it has been at least 24 hours since you posted the topic and no body answered then reply to the first post so your topic bounces to the top. This is basic forum etiquette.
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If you want to use the admin upload for the header image then you will need to edit code in functions.php in the theme folder to specify a larger image and then change the CSS.
Find this: function bp_dtheme_add_custom_header_support()
And below you can see the heights. Make sure the HEADER_IMAGE_HEIGHT is 25px taller than the CSS height. This is to accommodate padding
define( ‘HEADER_IMAGE_HEIGHT’, 125 ); <—- this could be 325
height: 100px; <— and then you'd change this to 300px
