To add or edit a location, you can directly edit the corresponding yaml file using the github web interface. Click the pencil icon to edit.

Current required fields are:
 * name
 * lat
 * long
 * type (`school`, `company`, `research institute`, or `other`)

You may also add:
 * link
 * description
 * address

Possible sources for lat/long information are:
 * http://itouchmap.com/latlong.html (enter your location manually)
 * http://locationdetection.mobi/ (use your browser's location)