iTunes won't let me download a free app suck as kik or update Facebook because supposivly my payment was declined which is incorrect because they are FREE please HELP!!!!!

With your existing Apple ID, you need to provide credit card info that linked to your Apple ID.

If the apps are free, you won't be charged but the credit info needs to be there.

i put my payment methond in and it says its declined ? i do not understand its a FREE app and my credit card info is correct

The available payment methods vary by country. You can typically use these methods:

• Credit cards
• Content codes
• Store credit, including iTunes Store Gift Cards, Gift Certificates, and Allowances
• ClickandBuy
• PayEase
• PayPal
• UnionPay (requires SMS PIN for setup)

From here:

Payment methods you can use in the iTunes Store, Mac App Store, App Store, and iBooks Store - Apple Support