The grave of Tolkien

If I'm posting this message to a wrong forum or something like that, please inform me, because this is the first time I write here.

My question is.. I want to visit Tolkien's grave in Wolvercote Cemetery, Oxford. I have been in England only once in my life, so I don't know much about it. If someone of you have visited the grave, please tell me how to get there. I'm going to travel from London to Oxford by bus, but after that, I don't know what to do. I haven't succeed in finding a proper web-site which could help me.