How to download apps on an iPhone 5 c?

I just got my iPhone and it let me download a couple of apps. & now that I'm trying to download more it keeps making me put my iTunes password in and is saying I can't make a purchase unless I put my card information in. Even though the apps I'm trying to download are free. How do I fix this?

You need to have an Apple ID to download. It doesn't take more than 2mins to open it and iTunes is also required for syncing.

If you don't have an apple id yet then take a look at this article: http://support.apple.com/.../kb/ht2534" class='ext_link'>http://support.apple.com/.../kb/ht2534
If you already have an apple id then follow these steps.
1. Open itunes on your pc/mac
2. Click on the icon on the top left corner
3. Click on itunes store > My account(sign in if necessary)
4. Click on the edit button against "Payment Information"
5. You should see a "none" option, select it and you are done!

See this article and make a new Apple ID. - http://support.apple.com/kb/ht2534