On the Play tab, find the Heal spell, and press its die roll button - the d6 - that'll pop up the form to roll how much healing you got. At the top of that form are a control to change the number of actions you're spending (it defaults to 2 actions, but you can set it to 1 or 3), and switch to dealing damage against undead, and show you the amount of positive damage it deals.
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