Registered users will see different colored buttons in the locations overview of the NGGJ's lexicon, which they can use to contribute to the NGGJ in different ways. What lies behind, you can find out here.
The NGGJ editor of the locations entries allows collaborative work: multiple people can work on the same document at the same time. It reflects individuals changes, aids when adding footnotes and allows simultaneous communication between authors. How it works and where to find the functions can be found here.
NGGJ