This script has been discontinued in favor of its newer version. You can install it from github (recommended) or greasyfork. The newer version has all of the features this one has and supports multiple anime streaming site (currently kissanime and 9anime), as well as Manga websites.
This script allows you to get KissAnime streaming links directly in the currently watching panel on MyAnimeList. You just need to provide the right link for the kissanime streaming and it will show you the next episode if available, otherwise it will show a countdown. The script uses the comment section in your list to store the link to kissanime. The comment section can only contain the url. Only the last part needs to be inserted. Ex http://kissanime.ru/Anime/Shokugeki-no-Souma -> Shokugeki-no-Souma To easily insert the link in the comments you can use the search funcion integrated in the edit page. The script is only active when you are logged in and you are in currently watching to avoid longer load times.