There is a website where you can register as a local student. You have to fill in your profile, write something about yourself and also tag some spheres that you like, for example, music, sports, partying and so on. Obviously, you have to be a HSE student, be rather fluent in English and have a desire to help international students. Also you must realize that signing up for this programme you take some responsibilities. It’s highly recommended to be open-minded and ready to help.