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Click 'Edit custom field config' and proceed with the direct field configuration, additional information you can find in the Using Fabulous Custom Fields section.
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Please note, before using the field a user needs to allow access to Atlassian products from the plugin:
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That all, simple and usually like general Jira fields, now you can get experience with the field in the corresponding issue screen view.
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Find different ways how to use our solution in the Using using section