That is not how it works. You VM a sensei, asking him nicely to train you, and if he accepts, you make a thread. That is definitely not a way to ask a sensei
Well, u can find a sempai to teach u that. Although, ur suppose to send a message to people with orange or blue names and see if they can train u. Read there profile and see if they have a sempai
or people can refer you to the sensei table, I would but I'm being lazy. Its loaded with names of senseis, + if you cant get them to train you you can always get elemental training from a sempai.
Also in this part of the forums there is a list of the senseis you can find and contact them there also go to the bio page and they will have a rule/template page. Make sure you look at that first before making a bio.