Change age in sign up page

[madik]

H, Just want to change the age shows in sign up page to 18 coz it shows just 13 in it

• I certify I am over 13 years old.
• I agree to the terms of use and privacy policy.

and also i have changed to black templet but now it dosent show the site logo it shows only vshare logo pls advice me

cheers