Click on the cog icon on the right of the upper navigation bar on your Jira instance and head over to Issues.

On the left-hand sidebar go to Workflows and select a workflow you want to add a JWT function to and click on Edit.

Select a transition.

Select the conditions,validators, or post functions tab.

Click on Add condition/validator/post function.

Select the desired condition, validator, or post function - the ones provided by JWT Cloud end with (by JWT).

Click on Add to be redirected to the configuration page of the chosen feature.