I can't log into admin page

I have installed nopcommerce and when I go to my page www.sugarandspicenaughtandnice.com/administration. I enter my email and password in and I get Your login attempt was not successful. Please try again.

Can someone please help me :)

Have you tried to use the search?

https://www.nopcommerce.com/boards/search.aspx?searchterms=+your+login+attempt+was+not+successful