EDITED After you get the embed code to show, you use the "copy" function (you can only "copy" what you have already "highlighted" with your mouse).....

You might have already used the copy and paste function for the URL that will show under the screen that is usually already highlighted in blue (your browser might highlight in black, I use Internet Explorer, I think I have a built-in TEXT EDITOR...."highlighting" is a function of the text editing software...I think).

You have used the "copy and paste" function to transfer the URL,...you'll be using the same function to transfer the embed code into your post.

Anything highlighted in blue is ready to be copied by the memory chips in your computer. You simply drag your mouse pointer/"cursor" over the text that you want to copy into the memory chips and click "Copy" on the "Edit" menu. Then, when you are writing your post, you can "PASTE" the text that you copied (if you have the text already "copied" into your memory chips)....of course this will not happen if you forgot to first highlight some text).
=====================So, here we go.....
.............AFTER you have highlighted the text to be copied...

There are 2 ways to "copy and paste". One way is with the mouse, the other way is to use the keyboard.

Using the mouse, see the "EDIT" choice at the top of your browser, click on that to see the "EDIT MENU",...
.......then click "COPY".....Use the same menu when you are writing and want to "PASTE".

....(open the menu IF YOU HAVE ALREADY HIGHLIGHTED SOME TEXT right now to understand the procedure, if you don't HIGHLIGHT anything, the menu will not show "COPY").

The second way is to use the keyboard.

The 2 keys "Control" and "C" copies whatever you already have highlighted (while pressing the Ctrl key and the "C" key AT THE SAME TIME)...
........and then use "Ctrl" and "V" at the same time in order to "PASTE". Tweet