Spawn units manually from custom building

[ChronicRhyno]

I can't quite figure out how to make Zerglings spawn from a button on the Hatchery. I added the ability Barracks - Train so I can make it spawn the barracks units, but I'm not sure how to go about making it do zerglings or custom mobs.

When I tried with the larva morph ability it didn't quite work, it tried to morph the hatchery into a Zergling.

I also can't locate where I can change the amount of time it takes to create the units (I need it to be a lot quicker).

 

[ChronicRhyno]

I figured out how to make them spawn faster, but is there a way to add units to Baracks - Train

 

[ChronicRhyno]

Never mind, I figured it all out.