Hello @Maryvonne Brault
Welcome to the community.
While viewing your board, select Reports from the navigation pane on the left.
What you select next depends on whether you are using a Team Managed project or a Company Managed project. It will say which it is at the bottom of the navigation pane on the left.
- Team managed: select "Sprint Burndown Chart"
- Company managed: select "Sprint Report"
Both of the above reports provide a pull-down selection list to select the sprint. Select the sprint you closed by mistake.
To the far right of that selection you'll see a button labeled "...". Click on that and select "Reopen Sprint"
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