featured/hero image

I am new to wp.  

Why is it that I cannot get my featured image to display large on twenty fifteen wp template? I can see it on the dashboard in lower right.  The mage is 1500 wide yet this is how it displays.  On other templates where image extends full width of screen (what I really want) the image doesnt' display at all!

http://screencast.com/t/h4AiUu3eMq0F
nsitedesignsAsked:
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Peter HartCommented:
its the theme.
you would probably  have to change style.css and function.php
I would probably create a child theme to do the changes
nsitedesignsAuthor Commented:
Not sure how to create a child theme.
Peter HartCommented:
check out this link for the child theme

if you don't make a child theme any updates to the theme will remove your changes

https://codex.wordpress.org/Child_Themes

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