I'm screaming what's the passcode😭
Assuming you mean the zip file passcode, uwu gave it to you. You can see how to get it normally by dragging the music player window to the appropriate desktop space as shown here:
Then play the songs in the order indicated by the numbers/arrows and listen for the numbers in the lyrics. Each song provides only one number.
If you mean the initial login passcode (or password) it is the dog's name and her birth year. Since the picture was taken in 2000 and she's 8 years old, she was born in 1992. Hence, Scotty1992 (or scotty1992 also works).