Where do I do the following?

nhatnguyen1980

Where do I change the header bg picutre?

http://hellofrommars.com/navishealth/contact-us/

The arrow on the top right corner, where do I go to remove that?

Albert

While you create/edit page, on right side you have option called "Featured image" and this is the place where you can setup own header image instead.

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nhatnguyen1980

How do I remove the widget that's on the top right corner header? The arrow in the corner. 

Albert

This can be turned ON/OFF in Theme options > Layout > Header section. Option is called "Sliding Top".

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