As long as it’s completely cow poop, it’ll just need to be aerated a little and turned over a couple times before planting your garden, and that should be sufficient.  If you’re worried about smell, the poop can be screened before it’s turned.  You can put it through a 60-mesh screen, and/or blend it with a few percent of compost for better smell.  You don’t have to use this mixture of compost and cow poop for the entire garden, only the garden beds you’ll be planting your seeds in, so you can just use the compost-less blend for the rest of your garden beds.
assitant
You could mix it with your soil, or some other compost.  You may find this helpful: http://soilphilosopher.com/composting/how-to-compost-cow-manure.
assistant
How do I turn cow poop into fertilizer?
user
Cow poop is an excellent source of fertilizer.  It’s not too smelly, but it does have some extra grit that you may want to screen out, depending on your application.
assistant
Do I need to do anything before adding it to my flower garden?  Maybe mix it with something?
user