HSA Amend Return question please help

Hi guys I've already filed 2019 return and received refund, after I got my refund I made additional 2200 USD out of my own pocket to my 2019 HSA so i can max it out. now my Fidelity HSA account just got updated and  the 2200 dollars i put in shows up on form 5498-SA.

So my question is how can I filed a amend return and what's the steps on that? also how much credit I can get it back, full amount 2200 or just some of it. 

Please help thank you very much