maybe the word attribute was misleading. as I wrote, I had added a text fielsd as explained in your topic (Catalog > Products > Edit, go to Customization tab, add 1 Text field, defined the label of the text field, save - I hope this is detailed enough...)
then went to the Product page but can't see any new "Product Customization" tab - see this link: http://weissjewelryshop.com/en/name-necklaces/611-hebrew-name-necklaces-personalized-necklace-14k-gold-.html