How do I reset an admin password for a Mac OS X without a install disc?

I cant figure out how to reset this password without an install disc or a bootable. I dont remeber the old password and every time I try to restart my computer while holding: apple key+ s I get prompted with: If you wish to boot the system , but stay in single user mode: sh /etc/rc localhost:/ root#... show more I cant figure out how to reset this password without an install disc or a bootable. I dont remeber the old password and every time I try to restart my computer while holding: apple key+ s I get prompted with:

If you wish to boot the system , but stay in single user mode:
sh /etc/rc
localhost:/ root#

I can't figure out what to do from here.
Please help Im not too tech savey.
2 answers 2