1. Not a template edit persay. You would need to edit the code in showphoto.php and the showphoto.tmpl
2. You would need to alter your cathead.tmpl and add them as the hardcoding is no longer in there. Everything has to be divisable by your thumbrow columns so if its 4 or 5 adjust the numbers accordingly but here is an example adding the code in bold for say a 5 column thumb row
Code:
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