Hello
i have 2 questions:
1- how people can unsubscribe from my bot? (need some guide for make button, or message to unsubscribe people for new broadcasts and stop flows)
2- how dont send message in new broadcasts for people, who alredy unsubscribe?
(sorry for my english, hope you can understand me;))
We have a tutorial here which talks you through all aspects of setting up a subscription broadcast. If you have any problems please don’t hesitate to ask further. 
Hello again, Karen
It’s very good tutorial!
Can you explain to me how i can do much much more easier unsubscribe(unfollow) from all bot.
Not from broadcasts, not from flows.From bot fully. Thx for friendliness
There isn’t really a way to unsubscribe to the bot itself, that would be the user deleting the conversation and not speaking to the bot again.
Can you explain a little more about what situation you would want this to happen in and why?
ok, let’s try:
I used bot for notification my subscribers about some event.
Untill event start i used in flow reminds message. After event i use “instant broadcast” to ask people what they think about this evenet. If people dont wanna visit this event again, how they can unsubscribe from my “instant broadcast”?
Maybe i can use some filter for “instant broadcast” to detach people, who write in chat key words like “stop”, “unsubscribe” or other.
That’s essentially what the tutorial shows which Karen linked
You can have a flow setup to listen for words like ‘unsubscribe’ that sets an attribute, i.e. subscribed = no. On your broadcast you then add a filter for subscribed does not equal no so that it doesn’t send to people that opted out.