Admin password

For? 

You gave us nothing to go off.

There's a support site with access to manuals, firmware, install guides, etc.
Go to https://www.netgear.com/support/
Type in your model number and from there it'll take you to the above.
Its a great resource to start with.

How do I perform a factory reset on my NETGEAR router? | Answer | NETGEAR Support