it looks like that you need to add custom meta box to your post page.
The simplest way it could be to use Advanced Custom Fields, check out Google for some tutorials, but of course you need to install additional plugin. (video tutorial: https://www.youtube.com/watch?v=xtqMatzVoSA )
If you want to achieve that without a plugin you need to add a meta box manually. There is a quite good tutorial which explains how to do this https://www.youtube.com/watch?v=ccbImB59JXQ you just have to modify it a little.
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