Who created the sprints that already exists? Have you asked that person for guidance?
On your Scrum board you can edit the sprint dates. First, navigate to the Scrum Board where you Sprints are planned. You will need to have sufficient permissions to manage sprints for the project(s) in the scrum board to execute these steps.
Are you working with a Team Managed project or a Company Managed project? It will say which type it is when you view the project (or Scrum board) at the bottom of the navigation pane on the left. The steps/screen below are from a Company Managed project.
1. Create the Sprint
2. Click Add Dates
3. Enter the date range you want for the sprint.
If the sprint already exists, you can click in the ... button to the right of the sprint and select Edit Sprint to open the dialog again and change the dates.
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