How to edit a static site on Tilda?

Question

Web development

Hello! I must say right away that I am not a website builder, but a blonde. Maybe someone knows how to solve the problem: I made a website for my teacher in tilde, downloaded it. Even uploaded to the hosting. Then it needs to be slightly edited, add a small text, I decided to download textolite according to the instructions "in the root folder". Everything went down, of course. I restored the backup and now I'm afraid to touch it all. How to edit such sites? What can be used? Please tell me who knows.