Hi yura, can you take a screenshot for me? Do you know how to do that and then upload it here?
Screenshot:
Press Command + 3 to take a screenshot
Press Command + 4 to take a screenshot of a specified area
Press Command + 4 then Spacebar to take a screenshot of any open window or icon.
Then when you create a post, go to Advanced and scroll down to the "Manage Attachments" button in the Additional Options section to browse for the file to upload here ...