When you install the BubbleIQ App and authorize Zendesk, by default it creates two triggers in Zendesk called BubbleIQ and BubbleIQ2. The BubbleIQ2 trigger is used to monitor updates on all tickets, you should never change that trigger.
The BubbleIQ trigger is how tickets can be sent from Zendesk into Slack. Here's how to set that up.
First, in the channel you want tickets to post to, invite the BubbleIQ bot into the channel using "/invite @bubbleiq", and then say "@bubbleiq zendesk-channel." The bot should respond with a confirmation.
Then, go to Zendesk and go to Settings->Business Rules->Triggers. By default, the trigger will look for any ticket tagged with "bubbleiq" and send it to Slack.
You can modify the conditions to be anything you want, whatever custom fields, statuses, or other changes you would want to cause a ticket to post to a Slack channel.
Do a quick test of the trigger, create a ticket that matches the criteria you created. In the default case, it's just tagging a new or existing ticket with "bubbleiq."
That posts to the channel!
You're done! Any ticket that meets your criteria going forward will post to Slack, and Slack users can edit it, reply to it, and more.