How can my userbot send a message to the chat discussion below the tellegram post?

The link to the chat is dynamic and I do not know how to extract the id of the chat to leave a comment, or how to do it in another way

I need my userbot to retrieve a link from the "leave a comment" button or to click on this button to redirect to the chat room

Solution

You don't need to. the library will deal with that, you just use comment_to in send_message or send_file, passing to it the id of the broadcast message with comments enabled.