I've used it as a deer repellent (it worked for a while but probably needed re-applying and I couldn't get any more at the time) - the Milorganite web site does give instructions for using it as a fertilizer on daylilies: "½ cup per plant, early spring, late summer, and late fall"
http://www.milorganite.com/gar...
The nutrient analysis, including how much N is slow release, is on this page:
http://www.milorganite.com/Pro...
The slow release N part requires microorganisms to work on it, which happens when the soil temp is between 55 and 85⁰F. Bear in mind that it has no, or almost no, potassium so if your soil is lacking in that you'd need to provide it some other way.