With your mouse, left click at the beginning of the passage you want to copy. Do not release the left click, and move the cursor to highlight the entire passage you want to copy. When you have it all highlighted, release the left click, and it should stay highlighted. Now, push down the Ctrl button and the C key at the same time Ctrl + C. This will "cut" the passage that you highlighted. Now, come to this site and left click where you want the copied passage and push Ctrl + V.
That should paste the passage here.