Go to $SPLUNK_HOME/etc/passwd and look at what users are defined. Now you know the username. Try to login with that user and PW= changeme ; it probably won't work. Grab the PW from that file and then use the method here to decrypt it and reveal the PW:
https://www.hurricanelabs.com/splunk-tutorials/make-splunk-do-it-how-to-decrypt-passwords-encrypted-by-splunk
There are other methods but this is the easiest one that does not require you to have an admin-level uers's login (this only requires CLI access; it does not require any splunk user).
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