How do I claim bitcoin from an old wallet? at my Blockchain "Bitcoin Address" page, it shows "Unspent Outputs":
Summary:
Address, Hash 160, Tools and 
Transactions:
No. Transactions, Total Received and Final Balance. (I HAVE 0.4 FINAL BALANCE OF BITCOIN).

Then a REQUEST PAYMENT button.

I have some Bitcoins (0.4) in the Final Balance of "Unspent Outputs".
I used this back in 2016.
Today, 9th November, 2017 i opened a Blockchain Wallet for the first time.
It says i have a $0 balance.

My question is, how do i transfer this balance (0.4) to my Blockchain Wallet.

Any help would be greatly appreciated.

regards
Kel.
From your earlier (now deleted) comment, I think this is your address: https://blockchain.info/address/176T2BxKAraEnusvuuK48RPA5yVYQRhMdc.

You need access to the original wallet with which you received the bitcoin. Which wallet did you use back in 2015 and 2016? Can you still access it? The "Request Payment" button is for sending more bitcoins to that address, not for spending the coins that are already there.