Take the metro from ‘München Central Station’ to ‘Allianz Arena’. Take the metro to Holzkirchen on track 3. Get off after 2 stops at ‘Munich Marienplatz station’. From that station you have to take the metro to ‘Garching, Forschungszentrum’, after that get off after 11 stops at station ‘Fröttmaning’. After a 10 minute walk you will reach the stadium.