Once inside of your account, you can click on the head and shoulders icon at the top right
Click this icon and then select My Account from the drop down menu
This will bring up a list of your active services
You can select services by clicking the tick box next to them
When selected you can then click the Actions button and choose Push To New Account
You will then be prompted to out in the other users CHI Username before clicking Transfer
This will send a request to the other user to accept the transfer. It will show in the Transfers section of their account - https://chi.uk2.net/account/transfers
Once accepted, the services will be moved fully into their account