You can then enter your new license key there along with your admin login details to verify the change. If you are moving to a different hosting provider it will not be possible to take your license key with you, a new license key will be required for use at the new location.
Please contact your hosting provider to have them update the license for use at the new location. If this is the case then you won't be able to reissue your license from our client area because the domain and IP are not allowed to change. There are 2 different scenarios as below. How this is done depends upon the license you have. When you move your WHMCS system, if the domain, IP or directory you use it in is changing then you will need to have your license updated.