How to use task creator in Slack
In any channel, type /clickup new to initiate the new task creator

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Slack will prompt you with a task details window where you will create the task
Authorize Slack from the 'Integrations' page
Note: Only Workspace admins have access to integrations.
To use the task creator, visit the Integrations page in your Workspace Settings. Click the Slack button and you’ll be redirected to Slack to grant ClickUp access.

Slack 3.0 Actions
Have you ever wanted to create a task about a message in Slack? Check out this doc to learn how!

Authorizing also lets you unfurl links in Slack!