THEMA: xss vulnerability

I have found xss vulnerability your website pic are attach but give me this error Failed to create attachment directory. i give u this link to view xss bug https://imgur.com/a/YOPXstB if any bug bounty u pay i will tell you detail.If no bounty plz dont reply this message
Cross-Site Scripting (XSS) attacks are a type of injection, in which malicious scripts are injected into otherwise benign and trusted websites. XSS attacks occur when an attacker uses a web application to send malicious code, generally in the form of a browser side script, to a different end user. Flaws that allow these attacks to succeed are quite widespread and occur anywhere a web application uses input from a user within the output it generates without validating or encoding it.
https://www.owasp.org/index.php/Cross-site_Scripting_(XSS)