Here you can select which Rounds within a Date Range or played on a Certain Course are to be used when the Statistics are calculated:

You can use the Date and Course Tabs to switch between selecting based on a Date Range or based on a Course. When using a Date Range, select the Begin of the Date Range with From and the End of the Date Range with To. When using a Course, select the Course in the Dropdown. In both Modes you can:

Only these Rounds	Check this Box to only use the Rounds within the selected Date Range or played on the selected Course for the Statistics
Use these Rounds	Check this Box to include the Rounds within the selected Date Range or played on the selected Course in the Statistics - the Settings for Rounds outside the Date Range or not played on the selected Course are not changed
Don't use these Rounds	Check this Box to exclude the Rounds within the selected Date Range or played on the selected Course from the Statistics - the Settings for Rounds outside the Date Range or not played on the selected Course are not changed

Tap on OK to apply the Selections or on Cancel to Abort.