Compendium

Hi guys, i bought Dungeon of the mad mage and now i want add "Monster Manual" in the game but it doesn't work.  Someone can help me ?

Things to check: 1. You have purchased the Monster Manual 2. You have chosen to use the 5e compendium in the game. This should be automatic if you have used the D&D 5th Edition by Roll20 Sheet. If you are using another sheet, you will need to activate the 5e compendium in your game settings. 3. Monster Manual entries for monsters not already in the game should be in the Compendium tab.