Click the magnifying glass on the right side of HP box on the main page. There you should be able to adjust individual components of the HP pool with the ctrl+mousewheel trick.
Printable View
What type is the PC? If "Eidolon" then you can't manually change the HP. If type = "PC" then you can manually change the HP, and don't use Eidolon linking from the base PC.
You can use CTRL + mouse-wheel to apply a modifier to any of the number fields that allow this (they have a small "+" sign in the top right of the field) - see "Temporary Modifiers" in here: https://fantasygroundsunity.atlassia...#Number-Fields The "MAX" HP field on the PC main tab is one example, and there are more within the HP details window for the PC.