Help...how to recover root password ??

Yesterday i sent a query on how to recover root password and i had several steps spelt out to recover the root passwd. step 1 at lilo type linux init=/bin/sh this worked step 2 change delete root passwd from /etc/passwd i could not achieve this. passwd file was read only. step 3 what is the command for mounting / read-write ? I need this solution for without it i cannot change my /etc/passwd luckson