To log-in to the production version of your site:

Browse to http://yourdomain.com/user
Enter the username and password in the form that appears, then click "Log In."
Note: Your username and password will be supplied by your site administrator.

Note:  The ‘forgot your password/request new passwork’ link will send password reset instructions to your registered email.  Depending on the email settings of your website, the email may accidentally be flagged as spam. Be sure your contact info/user profile up-to-date.

After successfully logging in with your username and password, you should see a black toolbar across the top of the page similar one of the following:

This Administration toolbar will allow you to perform multiple functions on the site. Note that the links available in the black toolbar differs depending on the permissions your user account/role has been granted.