Drop Down Button In UPDATE Page?

I had successfully created a update page for a registration. But now I went into a problem.

1: In REGISTRATION page (Where they submit their data for the first time), they are able to use Drop down button to choose their answers. In my UPDATE page (Where they can edit their data), I can only create textbox for them to change their data which they originally used Drop down button.

For example: In REGISTRATION page, they can choose Yes/No from Drop Down button. In UPDATE page, they need to type in Yes/No instead from Drop Down button.

How can I create drop down button in the update page with their previous answer selected?