To assign a floating IP to a load balancer within the Horizon dashboard:

1. Click the arrow under the Actions menu next to the load balancer and select Associate Floating IP:

2. A wizard will pop up that allows you to select an existing floating IP or a network from which a new one can be created:

3. Once a floating IP or network has been chosen, click on the blue Associate button to associate the floating IP with the virtual IP of the load balancer.

The load balancer details will be updated to reflect the new floating IP.