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I tried to enter the website mugenarchive but it keeps saying access denied and that i need to show the site owner error code 1020.
Please can someone help me.

Sorry, but this community cannot help. As you’ve been told already, you need to contact the site owner.

While visiting a site protected by Cloudflare, error 1020 “Access denied (Error: 1020)” indicates you’ve violated a Firewall Rule. When this happens, you’ll see the error “Access Denied (Error: 1020)” and your request was blocked by the filter based Firewall rule on the site. The access policies of a site define which visits are allowed. Your current visit is not allowed according to those policies. Only the site owner can change site access policies: