Just want to change PiHole UI password

Hi - pihole is installed and working. I just want to change the default PiHole WEBUI password.
i have opened the pihole terminal and typed this:
pihole -a -p
and restarted the pihole instance .
Do i need to connect to its docker 1st ?.. i dont know the ID .. i tried just pihole :p..
Sorry way new to this .
do this ?

docker exec -it /bin/bash

thanks.