I would recommend that you talk to your employer's HR department. They should be able to answer that question for you or direct you to the plan administrator who has that information.
Call Human Resources and get the phone number of the Plan Administrator. The Plan Administrator can answer your questions and also give you directions to access the online portal, where you can review your account anytime. Many plans do not do employer contributions until the end of the year.
It's also possible that you no longer work for that particular employer. You can use the Brightscope search functionality by going to http://www.brightscope.com and entering in your employer in the search box on the right hand side to find out who the administrator is. If that doesn't work, you can also look at the Department of Labor's abandoned 401k plan search here: http://www.askebsa.dol.gov/abandonedplansearch.
If you look at the last statement you had received from the plan there should be an 800 number listed which you can call and ask that question. Conversely as the adviser above has responded you may contact your HR department for that information as well
In addition to the above suggestions, you may want to contact your employer to request a meeting/seminar so you can better understand your plan. The type of information you are requesting should be easy for you to find, so a meeting with them or the plan vendor would be helpful.