To unlink the Starter key from your Cloud DB, you will need to delete the key (the link is visible in your screenshot). Then you can assign the Cloud DB to a Bronze key.

https://developer.vuforia.com/library/articles/Solution/How-To-Create-an-App-License

https://developer.vuforia.com/library/articles/Training/Vuforia-License-Manager

https://developer.vuforia.com/library/articles/FAQ/License-Manager-FAQ

Hi dm3d, 

As your suggestion, i have deleted the starter License Key then the key is unlinked from my Cloud DB. Now how can i assign the new license key to my existed Cloud DB ? 

Showing an error like No License Keys Available. 

I have attached the screenshots. Please have a look.

Thanks in advance!

You need to create a Bronze license key first and then you can assign your Cloud DB to it. See this guide:

https://developer.vuforia.com/library/articles/Solution/How-To-Create-an-App-License

Hi,

We have created bronze plan and trying to assign new bronze plan license key to Existed Cloud DB.

But it shows No Licese Keys are available (which shows as my previous posts).

how to assign new Bronze key to Existed Cloud DB.

Thanks !!! 

I just checked your account and there's no Bronze license keys listed.