My site is compromised

I would like to know how to remove the caption and how to clean the site. Thank you.

Carefully follow FAQ My site was hacked – WordPress Codex.

Then take a look at the recommended security measures in Hardening WordPress – WordPress Codex and Brute Force Attacks – WordPress Codex

If you can’t do the work yourself, consider looking for a reputable person on https://jobs.wordpress.net/ or https://directory.codepoet.com or https://upwork.com

(FYI, it’s not a good idea to respond to work offers from random forum users who have read about your issues.)

Thank you very much, Mark. I will contine trying with the “plugins in the repository”… ;-)))