forgive me for not paying any attention and being completely...

forgive me for not paying any attention and being completely clueless but I'm more of a buy and completely forget I have shares trader. could anyone fill me in if I need to do anything with this merger thing happening. I got myself around 20k worth of share at 42c before this merge was announced. I trade (buy and forget) with ASB security's in New Zealand. so my question is will I automatically get the new company shares or do I need to fill out some forms etc etc
cheers