What is the problem?
If I change the username and password when setting up the Octopi image, are these the new Raspberry Pi credentials? I am asking because I am not able to access my Pi server via SSH pi@ip address. The default password of raspberry doesn’t work.
What did you already try to solve it?
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Have you tried running in safe mode?
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Did running in safe mode solve the problem?
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Systeminfo Bundle
You can download this in OctoPrint's System Information dialog ... no bundle, no support!)
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Additional information about your setup
OctoPrint version, OctoPi version, printer, firmware, browser, operating system, ... as much data as possible
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Yes. So it is very important to remind them.
I always change the username and password in the imager customization even if they were set correctly for the previous image (the password shows as a hash so I can't tell for sure).
If you don't want to recreate an existing image, use Gina's method:
Take the SD card out, put it in a card reader. Create a file octopi-password.txt on it, containing a new password as it's only line. Unmount, boot, login with the new password. Put that in ages ago for cases liked this and for easier provisioning. Should hopefully still work.
If you changed the username to anything but "pi", I'm not sure the above will work.
On my OctoPi systems, there is a file in /boot (or /boot/firmware) named userconf.txt that contains an entry pi:<hash>. There might be one on your image that has a line with the username at the beginning.