WordPress fix Can’t edit my website after upgrading to 4.8.3

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Can’t edit my website after upgrading to 4.8.3, by wellness3

I upgraded my site to 4.8.3 and it returned with some errors but my site http://www.mariakoropecky.com is still live on the internet. I have tried to make edits like changing words on an existing page but when I update the page, it says “Oops! That page can’t be found.”

I also tried to create a test page and it won’t let me add media.

What do I need to do to make edits and add pages to my site? Thanks in advance for your help. Maria

Can’t edit my website after upgrading to 4.8.3