Hi Kiersten,
We will be glad to help you out with that, but we will need a bit more details on your issue. What have you been able to do? Where are you getting stuck? Do you see any error messages?
Here are some general Trello and Slack resources that might be useful, but please let us know what is the issue you are facing and we will try to help you out.
https://trello.com/power-ups/55a5d917446f51777421000a
https://trello.com/platforms/slack
https://help.trello.com/article/1049-slack-app
https://help.trello.com/article/1050-connecting-the-slack-app
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