The application needs to be made online.
You'll follow a step by step approach making selections from the drop down menu's
The Main Page for the online application is here at Welcome to Visa4UK
If you've already registered for an account then just log-in. Otherwise hit the 'Register an Account' button.
The 'Personal Details' Form VAF4A is a generic 'one-size-fits-all' form which all applicants complete.
If you'd like to review the 'paper version' forms (highly recommended) then follow these links:-
Personal Details Form (VAF4A) - Family Settlement Application Form
APPENDIX 2 (VAF 4A JULY 2012) - Financial Requirement Form
Guidance Notes