Is it possible to use methods(such as :GetRankInGroup(etc)) on a player that isn't in the server, if so could someone post a link to a tutorial or something like that? Thank you in advanced. If it is possible, I'm guessing there is a service or something(Please tell me if this a request, I would appreciate it)
No, scripts can only affect players on the server, not off the game or on the website. You would have to either go though very advanced scripting or just get the rank of the id of the player. So for example, just find the player's ID online and paste it between that or something I think.