Copy / paste in "enter code here"

Hello!
When I try to put the code on “enter code here”, I can do it by typing, but not by using copy/paste.

Please, what to do if I want to copy/paste sth?

Hope the problem is not in my pc!
Many thanks!!!

It seems your problem only occurs when the window is completely empty. When I have one single character (no whitespace) entered, the two marks occur after clicking the “preformatted text”-button and I can paste the code from the clipboard.
If that doesn’t work just type a single whitespace after clicking the button and paste your code in the resulting gap between the two marks. Or just enter the marks manually from your keyboard.

Tried to enter the marks manually, but they are SIMILAR AND NOT THE SAME!