By completing an application, you are not committing yourself to anything. Rather, you are simply giving us the basic information needed to see what programs are available to you, how much house you can afford to buy, what the payments might look like, and how much money you may need to pull it all together. If refinancing, how much you can save, how much cash out you can get, and more.
If it all looks good, we still need you permission to officially move forward. If not, no harm done in reviewing your application.