This is a tricky situation. If you registered with an old email address you cannot access, try these options:

Do not use predictable passwords like PS3R123 , password , or your username. Hackers use automated "brute force" scripts that try these common combinations first.

If you are actually looking for a password to (and are seeing a QR code), you need a Device Setup Password from Sony, not a site-specific password: Step 1 : Log in to your account at PlayStation.com . [5.6] Step 2 : Go to Security settings. [5.3]

If you’ve forgotten your password for ps3r.com, follow these steps to securely reset it:

To understand the password situation, one must first understand the nature of the website itself. In the heyday of the PlayStation 3, numerous "ROM sites" and file repositories existed to share games, updates, and homebrew applications. ps3r.com appears to be a relic of that era, or potentially a domain that has been repurposed or abandoned over time.