Move a resource to another stage if this phase needs more capacity. You can only move a resource to another stage if this resource is linked to this stage in the plan board settings (employee tab).
You can also duplicate a resource to another day. This means that the resource plus its availability to another day. When moving the resource, hold the CONTROL (Ctrl) or the COMMAND () key. When moving the resource, you will see a '2' in the avatar, indicating that you are duplicating. With this action you can easily make it possible for a resource to become available one day, which is not included in its schedule by default.