Go to "Board Settings --> Edit Board Settings --> Additional Fields"

Click on the checkbox "Enable Jira Flagged/Blocked Field"

You can enable this field for both Kendis only cards and Jira cards

Select the field name from Jira

Note: Default Jira field is "Flagged", select this field unless you have customized that in Jira and using a different field.

Once enabled this field will be visible in the "Edit" option for your features and stories.
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When a feature (Epic) is flagged, a small red flag will be visible on the card

If a story under a feature is flagged, there is an orange flag visible

It is possible to filter the stories or features (Epics) that are flagged on your board.

Click on the More Filters

Select the "Flagged" option.

After enabling this field when I open for edit I don't see the "Impediment" checkbox.
Answer: If the "Flagged" field is not enabled in Jira for your issue type and project, Kendis will not show this option. You must go to Jira and make sure the "Flagged" field is enabled for your issue type and project.
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After enabling the Flagged field in Jira, it still doesn't show up at Kendis?
Make sure you have updated "Project Meta" by going to "Board Settings --> Edit Board Settings --> Jira Meta"