Is there an implementation that a non-technical person can use to certify certificates?

Hi! I’m no dev but I really wanted to test the solution by certifying some certificates of a formation program in the company I work for. Someone had mentioned Proofplum but the website doesn’t seem to work. Any other suggestions?

I tried do clone the git and run it on my machine but I’m so rusty in dev that I don’t consider myself a dev any longer. I couldn’t find any step-by-step for dummies so I could issue it myself.