What is the process for Tier 2 ICT extension?

[smb2015]

Hello,

Can someone please help me to know what's the process for Tier 2 ICT visa extension ?
I only know that I need to fill the form online on UK home office website, submit and pay the fees.
But after that where do I need to sen my documents and how to send the Biometric details ?

[CR001]

The online process will tell you what to do once you have paid etc. You can also look at the guidance notes for information.

If applying by post, HO will write to you to go and enroll your biometrics at the Post Office.