Put the cursor where ever you want to begin, copying. Click return, so cursor is flashing.
Press the down arrow down, while pressing the shift button, it will be highlighting . After finishing highlighting, (using ARROW KEYS up(copies moving up), down(copies moving down) left(moves backwards) right(moves to right slowly) press CMD KEY (Or if on a wired keyBoard, press the window button or ctrl & alt button down) while PRESSING C button it should copy. Take the copy item to where ever you want to insert it, (could be on the same page, another page. Copy will stay in browser until, you copy something else on top of that or until you shut your browser off) and PRESS CMD (or if on a wired KeyBoard, press window button or ctrl & alt button button down) V button down. That should paste (what you copied should show up) it on the page you want it too.. Same goes if you want to copy in the middle of a page, just place cursor hit return (Make sure cursor is flashing) and do as above.

Now if you are on a page that your cursor can not be placed on a word that you want to start copying (for example someone SENDS YOU SOMETHING AND YOU CAN NOT EDIT IT, THAT IS WHEN YOUR "FIND BUTTON" comes in USE. Use your FIND KEY BUTTON (On Top Row) type in the word you want to start copying from, if there is the same word as the word you want to begin copyng before that one word, just hit find again, still with the word you want to begin copying, it will go down to the next word that is the same as in the FIND KEY BUTTON. There may be 3 exact words before the one you want to start copying , just keep hitting that FIND KEY BUTTON, until it highlights the word you want to begin copying from. Just do the same as above.
Other links on CC&P below. Don't quite understand this, look over those instructions....