In previous versions of Telegram, users were not able to add bots into any group or channel due to the disability of searching and adding by usernames. In the latest version of the app this problem has been resolved and you can add any up-to-date bot into your groups and channels.
In windows version of Telegram, once you are in bot’s profile page you see Add to Group option right beside Send Message.
Now this bot is a new member of the group.
Remember that all the updated bots have the adding option and if there isn’t such thing for a bot, this is either because it is not up-to-date yet or the developers have disabled this option for the bot.
Removing Telegram bots from a group is easy as well. Follow these steps:
Go to bot’s profile and choose Stop and Block bot from the setting.