I accidentally connect the group to Trello.
I receive
"XXXX has set up a connection to Trello so group members will be notified when the following events occur on Trello board XXXX:
- Card created
- Comment or attachment added to card
- Member added to card
- Card moved"
please please how to unconnect? or how to edit it? I don't see/could not find any option 
i sorry but I'm absolutely lost and I'm so ashamed...
please somebody help me