Blog Banner Not Working

[PeterParticipant]

Hi supporter !
My website url : http://www.mukier.com/blog/
Description about error: For some reason adding a banner does not work on my blog page?
http://i.prntscr.com/57b19b89415c4240afbbb5533ca762e8.jpeg
Can you please help?

I’m trying to make it like the instructions page.
http://prntscr.com/ba53ky

I have provided all of my wordpress login details under the advanced information tab

[Author]

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