How to Hack Wifi Admin Id and Password

okay, so this is how it goes...

I am living in a rented home and recently my owner had blocked peer to peer sharing and other advance features through the router, I have finally decided to breach through their user id and password using "kali linux" , that's where i need help.

Please tell me a step by step way through this..

I dont know their username or password as well, but i have physical access to the router..

Here is the model number : "vodafone- SHG1500"

I really need to enable this to be able to download torrents and other peer to peer service .

Thanks :)