Go to the tee sheet for the day where you want to change category.
Press the little settings icon in the upper right corner and select "Edit tee time categories".
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3. Now you are in EDIT mode of the tee sheet.
4. Select the tee times that you want to change buy clicking on the tee times (see #1 in picture below)
5. Select the tee time category you want in the drop down and press APPLY (according to #2 & #3 in the picture below).
6. The result will be as the picture below. Remember to press "Close" button to exit the edit-mode of the tee sheet.