In a few months ago, you created an address throught the online software and sent the address to the team to claim your coins. That claim is different from this new one. Now you have to use a wallet to claim again because the system has chanced a little bit and your coins will be sent to new address or addresses (if you have more than 3.8ti coins) with same password you have. In the mean time, when you use the wallet to claim this time, you will get an option to donate a % of you coins to the iota foundation which will do the work to promote iota.

The new GUI wallet is very easy to use. There is a good tutorial for the new GUI client - http://necropaz.github.io/IOTAtutorial.html