Grimm Wiki:Users

Registered users Users who have created an account and logged in are able to:
 * customize the appearance and features of the wiki by setting their preferences.
 * upload an image, video or other file to the wiki.
 * add pages to their watchlist, which can be used to track edits to a particular page.
 * maintain a user profile and talk page.
 * remove advertisements from all pages (except for the main page of each wiki).

(From Wikia)