Click the Insert Image button. IN the toolbar for posting, it is the third from the right.
You could also upload to imgur and send a link.
I'm still not sure what the problem is that you are experiencing. If the above did not help, please try this:
If you notice that the text seems large and is overlapping buttons and the UI in places, or the HUD is shifted to the left and above the table slightly, it is probably your DPI settings
Just change your DPI Scaling to 96/Normal - https://www.microsoft.com/resources/....mspx?mfr=true