Step 1: Click the Bot Link and Open Telegram
Step 2: Click 'Add to Group' and Select the Desired Group
Simply click 'Add to Group' and then choose the group you'd like the bot to be added to.
Step 3: On the Pop-up Page, Click 'Add Bot as Admin'
Grant the bot with all default admin permissions and click 'Add Bot as Admin'. On the subsequent pop-up, click 'Add as Admin' again.
Step 4: Confirm the Bot permission
Head back to your Telegram group and verify under the Admin list whether the bot has been successfully added.