The first thing you should do is know how to contact the people in charge. Your best bet is to click on the red Contact Us words on the top right of your computer screen. Ask them how to write for the site. Usually they would want an example of your writing style. You could come up with many interesting topics and if they like what they read more than likely they will choose your article to publish. I have written for an MMA website and also I went through the same thing. If you can prove to them that what you write is interesting they will have to accept. Hope this helps!

There is a link on their main page explaining the process.  Basically, you send them your story.  If they like it, they will post it.  If not, then no.

Well, the first thing is you'd have to find a newspaper or website interested in a story on Echinacities. 

There are advertisments in their jobs sections for local writers. You need to have lived in the city you are writing about for six months, and submit some previous writing samples.