Overexposed photos

To some degree - double click on the photos to enlarge it adn click edit - in the edit list click adjustments and under light you can play with the adjustments (you may have to show more edits features by clicking on the word "add" to the right of Adjustments -- adn to the right of some adjustments there is a v which when clicked will show more options)

LN

In the Adjust section of the Edit mode try reducing the Highlights just under the histogram:

To get all of these option click on the blue Add button at the top and check all of the options that appear:

Or you can try reducing the exposure and increasing the Shadows. Lots of combinations to try.