This article applies to 123-reg Domain names
This article will show you how to register your interesting a new gTLD.
Look for a category you may be interested in, and click the View Full List button.
Click on the plus icon next to the gTLD you wish to declare your interest in to add it to your basket.
When you are ready, click on the basket icon which will take you to the checkout phase.
Tick the box that states that you are agreed to the pre-order terms, then click the Complete Checkout button.
You will now have expressed an interest in a new gTLD domain extension.