what do you want to take a link out for? if the chain is worn out and stretched to the point you can't adjust it any tighter, it's probably best that you just replace your chain and sprockets before it jumps off and destroys your case. Worn out chains will cost you more in the long run. when they break or jump track.
But to answer the question, you need a tool called a chain breaker that presses the pins out. Or to do it without the tool, you can grind the head off one of the pins and then tap it through with a hammer and punch.