Channels are open for anyone to join. You can become a member in the following ways:
Search and join – Find the channel by searching for its name in the Public channels section in the search bar.
Use a channel link - If you have the channel’s unique public link, simply click on it. This will take you directly to the channel page, where you can join with a single tap.
Discover and explore - Browse the channel discovery feature, which showcases top channels.
Admin invitation - If an admin manually adds you to a public channel, you’ll be automatically added to the channel as a subscriber.