For every 6 hour period, you are limited to 6 location changes in your account. This means that you can make changes to your account 6 times within a 6 hour period. After that, you will have to wait until the next 6 hour period to make more changes.

With a free forecast subscription you are limited to 2 saved locations at any one time. With a paid PredictWind forecast subscription (Basic, Standard, Professional) you can have up to 20 saved locations.