Macro photography - focus stacking

Ok here goes.....my first question since joining yesterday....so please bear with me.

I'm using PSE 13.....at the moment all I do is adjust exposure, WB, clarity, colour, crop, dodge/burn and stamp etc.

So I want to get into layers etc.

So here goes....

I find that macro shots of flowers are not sharp across the depth I want within the image.

I've heard of focus stacking and I know what it is and how to take the images.

But once I've taken say 8 shots - each at a different focus points....how do I stack them?

Thanks.