How to insert the SSL certificate seal on the website

My site is hosted at goinfinite/DigitalOcean. And I’m having difficulties inserting the SSL certificate seal in my ecommerce, for example in the footer, on the payment page. Someone could someone help me, tell me where I can get some material, tutorial to teach me this?

To be more exact it is the one that when you click you are redirected to a site security check page.

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