Hi and welcome to the Community @Tanha! 

You’d need to add a Filter to the Zap to check whether the field has the desired value. It wouldn’t stop the Zap from triggering, but it would prevent it from continuing if that field wasn’t ticked as “yes”. If you’ve not used filters in Zaps before, check out our Add conditions to Zaps with filters guide to learn more. 

Hope that helps to get you pointed in the right direction. If you run into any issues when setting that up or have further questions do let us know!