First off, you right click to see the paste option, not left click. A left click is just a click, but a right click brings up the contextual menu which should have a "Paste" option. But as PrettiMidnight as pointed out, CTRL+C to copy, CTRL+V to paste
EDIT I just checked, the option to paste is indeed there if you right click. I'm glad I did this check though - I just noticed, after using computers for over 30 years, that there is a "paste as plain text" option. Which, if my experience in importing text from MS word has taught me anything, is what you want to do, otherwise the formatting can get wonky.
