How to Edit sign up page

Hi people , how can i edit sign up page , i want to change it from saying "I certify I am over 13 years old" to 18 years old

thanks

You can change the age in templates/signup.tpl

or you can change the age features from admin panel. Then select the minimum age.

Thanks all for supporting,
ya i do some practice on vshare, now i can modify theme and everything, here is my customized tube channel.
http://banglalyricsvideo.com/


Thanks all