Replay 360

Hi, I am a new user to Storyline articulate and have been using Replay to edit a TEAMS video and make a video of someone talking about their experience. I have started splicing the video (which has taken a while) and am happy with it but I need to crop myself out of the video. What would be the easiest or best way to do this? And is it possible to do it with the video I have already spliced or would I need to start again?

Thanks in advance for any advice you can give me!