Concrete floors attach a stud to it how do I do it

Use tap con screws

Concrete screws ~ Stainless Steel Concrete Screws ~ Tapcon® ~ Concrete Fastening Systems (http://www.confast.com/products/tapcon-concretescrew.aspx?gclid=CK-urJSVzJkCFQVuswoduALktg)

Lay plate drill through it with masonry bit sized for the concrete screws and screw down plate