To use a Lord, you have to assign him to one of your habitats. As soon as you have selected a habitat, the Lord will travel there. Caution: there can only be one Lord in a habitat at a time.
As long as the Lord travels or is stationed in the Hall of Fame, no skills or talents can take effect. Skills that are already running will be cancelled, when the Lord is sent to travel.
When the Lord is stationed in a habitat, the talents take effect and target the habitat automatically. Skills can now be used.