If you'd like to copy and paste something from the web or another post into your own post without using the "quote" function, here's how:
Take your mouse, and place your cursor at the beginning of the text you wish to copy, then click and hold the left mouse button, while pulling your mouse over the text. This should highlight the text. Now release the left mouse button. Now, with the cursor over the highlighted text, right click the mouse for options, and select 'copy'.
Now that text is on your clipboard, you can go to the spot in your post where you'd like to insert the copied text, right click your mouse again, and select 'paste' and you will have copied and pasted the text into your post.
This site lets you practice your cut, copy, and paste LINK
Here is a full description on Wikipedia LINK