Faocus Stacking

Hi I'm using Photoshop and want to Focus stack four images.  The videos I have watched have started with  sugestion to use Auto aline images. I Found align buttons but not auto line.  The next step was to Blend images.  I cannot fine a blend button .  One suggestion was to find this in the Multilayer option, however I cannot find that either.

Is there a current video that explains how to focus stack images.