At the install you have edit the file vim /etc/openerp-server.conf And you certainly have set the configuration for your server like:

 [options]
; This is the password that allows database operations:
admin_passwd = PASSWORD
db_host = False
db_port = False
db_user = openerp
db_password = False
addons_path = /opt/openerp/v7/addons,/opt/openerp/v7/web/addons
;Log settings
logfile = /var/log/openerp/openerp-server.log
log_level = error

Your admin password is here and the admin panel is the "setting" panel.