there is no need for right click.
It does not use a mouse, you just click with your fingers. Whatever you see on the screen you can press with your finger and thats basically it.
if you are trying to copy text, just press on the text or hold your finger on it for a second and it will become highlighted. At each end of the highlighted text will be a little marker you can drag to make the selection bigger or smaller. When done selecting the text just tap on it and a menu will come up to allow you to copy.
To past the copied text, just press in a text area until the option appears to past.