Video - audio: sync

I am doing music videos with my android phone and the sound is not good.
How can I record music (just acoustic guitar) on Cubase and then
sync it to my video? Cubase LE AI elements 8

p585 of the manual
Cubase_LE_AI_Elements_8_Operation_Manual_english.pdf (steinberg.net)

Thanks very much for your help, Profdraper.