To edit your name or bio, click the Menu icon and select “Manage Channel.” To view your bio, click the Menu icon and select “View channel info.” The optimal dimension of the avatar on Telegram is 512px by 512px, and it’s recommended to use PNG format to deliver an unpixelated avatar. The Channel name and bio must be no more than 255 characters long To delete a channel with over 1,000 subscribers, you need to contact user support
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