Hi Marrows, I think you've got a few terms confused there. SSL is a special protocol used to encrypt sensitive data when it's passed from a client (web browser) to a server. SSL basically means you can be sure sensitive data is being transferred securely. It's used all over the web and you'll notice it when urls change from http -> httpS and creates that padlock you mentioned. Since SSL is already implemented there's nothing you need to do here.
Trusted Shops and Safe Buy in contrast are organisations that provide a type of accreditation service to e-retailers and customers. For the retailer it allows them to prove to potential customers they're a trust worthy/reputable site. To the customer it gives them confidence this site is reputable. Both services need to be paid for. Check they're respective websites for more information.
Hope this helps, Orchie
