I cannot remember my user name and password to access my linksys router through safari. Can anyone help me reset it?

Hello everyone. I purchased apple tv in August and I could not connect it. I called apple and they told me to call linksys who promptly told me that my 90 day warranty expired in September. I need to make my network more secure. However, I cannot access my router through safari because I forgot my user name and password. Is there a way to reset it?