noob postgresql user question

[eric-yrHdaQSNc4gdnm+yROfE0A at public.gmane.org (eric chadbourne)]

i have access to a database via phppgadmin.  i've created a new user and 
now want them to be able to use the db.

GRANT ALL PRIVILEGES
ON DATABASE all_knowledge
TO mr_cool;

it's not doing what i suspect.  my php scripts still can't access the db.

what's the magical incantation to give mr_cool unlimited access to 
all_knowledge?

thanks for any tips,
eric c.