You’ll need to use @BotFather to change your bot’s name, profile picture, description, and the text displayed in your bot’s profile. Just open @BotFather and use these commands:
/setuserpic — to change your bot’s profile picture.
/setdescription — to change the text you see when you first open the bot (the text above the Start button).
/setabouttext — to change the description inside your bot’s profile.
/setname — to change your bot’s name.