How do I find and share my YouTube channel address?

The whole point of having a YouTube channel is to share it with others. Instead of sharing the individual posts on your channel you'll want to share a link to the channel's main page. To do this, open up your YouTube app and tap on your Account icon in the top right.

Tap on My Channel.

Tap on the three dot menu in the top right, then tap on Share.

Now you have several sharing options. If you just want the link to post somewhere, tap "Copy link."