2How to set up a Telegram channel? (A step-by-step tutorial) 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. A vandalised bank during the 2019 protest. File photo: May James/HKFP. The creator of the channel becomes its administrator by default. If you need help managing your channel, you can add more administrators from your subscriber base. You can provide each admin with limited or full rights to manage the channel. For example, you can allow an administrator to publish and edit content while withholding the right to add new subscribers. Content is editable within two days of publishing
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