if its a actual link you should only have to left click it or right click > select 'copy link adress' > open new tabe (in Opera ctrl+w) > paste url > hit enter
if you want to open up multiple links on a website and use the Opera internet browser you can:
ctrl+shift+l (opens a list of all the url links contained on the web page) > highlight the ones you want to open> right click one > select 'open in new tab'