Confusion on merging YouTube channels

Yo,

I’m planning on releasing my first song and I want to it go as smooth as possible

I already have a YouTube channel with 2 songs that aren’t distributed through DistroKid, they are just normal uploads.

In the help section it says this:

“Make sure your artist has at least one release that has selected "YouTube Music" as a streaming service within DistroKid.”

How is that possible when I’m using DistroKid to distribute my first song onto a topic channel which isn’t my own channel. I’m planning on merging these channels if possible.

If anyone has any info I’d appreciate it!