I know this is a very old topic but i'm struggling with this in Prestashop 1.7.
In the footer of the store it shows the default information you can store in Shop Settings>Contact>Stores>Contact Details.
(i had to struggle where to enter this information by the way, it's very strange to me the general contact information has to be entered on a Stores page, since we don't have stores)
We want to show our company registration number as an extra line under the general company address, e-mail address and phone number. The strange thing is that there is a Registration field but whatever you enter there is not displayed in the contact information block.
The documentation says:
http://doc.prestashop.com/display/PS16/Store+Contacts+Preferences
Registration. Indicate your company's legal registration numbers, which depends on your country's legal system (Duns number in the USA, SIRET number in France, CNPJ number in Brazil, etc.). This shows that you are a fully registered business, thus giving a more reassuring opinion of your shop to your potential customers.
But why is this number not displayed in that block?? It doesn't make sense to me.
I tried searching for a .tpl file i can edit to add this information but can't find it. It seems to be very different from older Prestashop versions.
Please help.