How do I edit Tiktok video?

Hello guys,
I've been wondering how tiktokers edit videos with multiple scenes.
like where they are having a conversation between two "people" so that you don't have to dress 4 times everytime you record one sentence?
So that you can record all the sentences from the first person in 1 time and then change and then record all the stuff from the second person?
I don't want to edit it outside of Tiktok cause I'd like to use the green screen or any other different effect features on Tiktok.

I am struggling to find out the way...
Please help me out..

does this help

To trim a TikTok video, press the “+” button to record a new one.
Once you record the video, tap the “add a sound” option in the upper
right corner, then hit the “red button” to record the sound. Press the
“Check” icon at the bottom right, and then you'll find the “Trim”
icon in the upper right corner.

Lot of people are using Vneditor to edit their tiktok video
for double role you can also use kinemaster for editing preety simple to use .

I'm using capcut software for editing . Give it a try bro .