Scrum plugin tips 
- “Story points custom field” plugin setting isn't configured, you can configure it in Administration » Plugins » Scrum Redmine plugin
- “Product backlog items” plugin setting isn't configured, you can configure it in Administration » Plugins » Scrum Redmine plugin
- “Tasks” plugin setting isn't configured, you can configure it in Administration » Plugins » Scrum Redmine plugin
- “Task statuses for Sprint board” plugin setting isn't configured, you can configure it in Administration » Plugins » Scrum Redmine plugin
- “PBI statuses for Product backlog & Sprint board” plugin setting isn't configured, you can configure it in Administration » Plugins » Scrum Redmine plugin
- There aren't product backlogs, you can create them in Settings » Sprints » New product backlog
- There aren't Sprints, you can create them in Settings » Sprints » New Sprint