How to unlock a password for avg anti theft

I am using the avg anti theft in my mobile .I changed the sim in the phone.it asked me to enter the unlock password.but I forget the password.please help me

Hello Balaji,
We apologize for the inconvenience caused.
We understand how something like this will try your patience.
Please have a look at this article https://support.avg.com/SupportArticleView?l=en_US&urlName=Unlock-a-device-locked-by-AVG-AntiVirus-for-Android to unlock your mobile phone. If it fails please click on the following link https://support.avg.com/support_contact_form?l=en_US&retUrl=support_Android_AVG_Antivirus&prod=AVG%20AntiVirus and fill out your details, select as Android then the name of AVG Program that you installed in your mobile and in description explain about your issue completely and finally click on Email option. Our AVG mobile team will reply back to you via email with a resolution.
Please feel free to get back to us for further assistance.
Thank you.