If you want to increase (or decrease) the number of properties that you have in your subscription, is very easy.
You can add them or remove them by yourself, using option Manage your subscription, located on page Your account.
If it is the first time that you enter that section, you will be asked to login. (If you don't have or know your password, you can create a new one clicking on Forgot your password?)
In section Manage your subscription you will be able to add or remove properties from your subscription. You can also select if you prefer to pay it monthly, or annually (with a big discount).
If you have any doubt, please don't hesitate to contact us
The Vayoo team