Adding a bot to the resource

1) Go to the chat
2) Select the three-dot icon in the top right and click "Add user"
3) Choose your bot and grant it administrator rights

Service for obtaining a chat or channel ID

To find out your chat ID, use the service below.
Link to the bot for finding the chat ID - FIND_MY_ID_BOT
1) Forward the message from the chat to the service (as shown in the photo) and find out the chat ID
2) Add the chat ID to the site and the link to the chat (you can get it when adding the bot as an administrator to the chat)

You can watch the video with full instructions here