Grant privileges on nickname

please help me with the commend to Grant select,update,delete,insert privileges on some nickname for few users.



NICKNAME
PRODCAT.PC_RULE_MSTR_NICK
PRODCAT.PC_RULE_CONDITION_PARAM_VALUE_NICK
PRODCAT.PC_CONDITION_PARAM_MSTR_NICK

USERS
PREUSER
PRODCAT
DEFP