How to add a subscribe button on youtube?

I have a gaming channel called Minecraft Productions (go check it out if you want)
and i was wondering how do you get the subscribe button on your video. What i mean is when you click a video and in the top right it has your icon and if you hover over that it will come up with a subscribe button how do i get that

Guest

It is already there. It is automatic and will appear next to your channel name on the video.

Maddie

You on the youtube editor and add the link to it from your video.

Bob

Add it from the editor. Maybe we can become YouTube buddies too? My channel is Dameleon. Let's do collab mc one day

Damian