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The clickable zones are visible because of the "+" icon. Hovering over the image with your mouse, you can see a little window that presents the image’s name, default image, short description, and price.
Attachments
That tab was explained step by step in the "Managing Your Catalog" chapter of this user-guide, in the "Managing Attachments" section.
Tags
The PrestaShop Tag feature enables you to associate your products with keywords. Your customers can use the keywords to easily and quickly find the products they are looking for.
For instance, let's say customer wants to find an MP3 player in your boutique. In order to find the product corresponding to his search, there needs to be a tag to associate “MP3 player” with “Ipod Nano”.
You have two ways to set up this feature.
First solution: Create a Tag
You can associate several tags to your product directly in the “Tags” field from the moment you
create a product. See the "Managing Your Catalog" chapter of this user-guide, in the "Adding a Product Description" section.
Second Solution--Creating and managing Tags.
Once you have filled tags for all your products, you will get a very important list of tags. The best way to manage them is to go to the “Tags” sub-tab under the Catalog tab.
You will arrive at the list of all the tags used in your store in all languages.