[Q]how to run TWRP recovery when Booting? topic

hi guys im totally new with G2,im with sony's device earlier.i have installed twrp recovery but the only way to run it is i have to install another apps like quick boot to run to recovery mode.when i was on sony's device i just simply press vol up button when sony's logo comes.another methods is simply tap sony's logo.but on LG G2 i can't do that.anyone know how to run to TWRP recovery when restarting the phone.this is really matter when we got stuck an bootloop or something went wrong and we need force restart and go to recovery.please help me