How to cook 2 oz chopped octopus for takoyaki?

Hi, I'm planning on making takoyaki for the first time and I'm unsure about how to cook the octopus. I got octopus from a local Japanese market and it just says "seasoned octopus" so I assume it isn't cooked yet. It's only 2 oz and I couldn't find a specific reference point online to go off of. I'm nervous about cooking it wrong and possibly getting sick because of it so I'm asking for some help. Thank you! 😊