Only channel admins can update channel name and description, access your channel, click on the three dots and click admin

Simply type @ then type the members name

Access the search bar, type a letter or number, you would see suggestions based on what you type, click all

As a member of a private channel you cannot invite a member. As a member of a public channel you

On web, scroll down on tea spot, till you find Channels, click join channels, you would see all the public 

On Web, scroll to channels on tea spot, click Channels, you would see the channels you belong to On mobile,

Click on the reaction on the post Click on the preferred reaction (fist, raise hand or fist bump)

Click on repost or share icon on the post You can add more details and click post

Click on the three dots on the top right of your post Click or tap copy link to post

You can find all your post in your profile pace, scroll to find my tea