How do you change your password on the ArchMC Minecraft server?

yoh, guy, I have a my own Minecraft PFP now. look this

if i remember correctly it's /changepass

/changepassword (og password)(password u want to change to)

its not working can som1 help me  they have ededit /email and other stuff and not working

My friend's account has been hacked, what should I do?

Id do register email and try to change it there