How to voice-over iPhone Videos or on Youtube Capture?

I'm currently trying to start my first youtube channel with my best friend, and we use Youtube Capture for filming. But when we speak, it lags after the actual video. Is there any free apps or tricks for this? Also, how can we stop the music after a certain clip? Thank you guys in advance.
(YT channel: Positive Vibes) (Instagram: positivevibes_yt)

Hi. I don't know of any free software for video editing but here is free recording software. It's great i use it.

https://obsproject.com/

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