From anywhere on the OneUp site, click the More menu at the top right of the page and select Data Management from the menu that appears.

On the next page, enter the date range that you’d like to show data for (this is the date you wanted the performance to be logged against, not the date you uploaded it).

Select the appropriate record type - either Manual via OneUp, or Spreadsheet via import.

Finally, click Fetch Records, and any manual data present on OneUp during the specified time period will appear.

From here, you can then view and delete anything you need to by clicking the X on the right hand side of the data entry.

If you want to amend data, simply change the value and then click the save icon on the right hand side of the data entry.