1. Have the scroll with a spell on it (that isn't already in your spellbook) in the wizard's inventory - it must be identified (obviously). Select your wizard and right click to bring up the radial menu, and go to the human figure icon on the left side of the menu (where you would access the talk and call familiar options) - there should be an option to copy scroll, which will expand out to display any non-memorized scrolls you have in your inventory. Click the spell/scroll you want to memorize and your wizard will have to make a spellcasting check to successfully copy the scroll. You may want to save before trying so that if you fail to copy the scroll, you can try again (you lose the scroll when you fail).
2. Heal, as a spell, is not available to clerics in the game - it is a 6th level spell, and a 10th level cleric only has up to 5th level spells. You cannot make potions or scrolls of heal, nor can you convert other spells into a heal spell.
Then again, knowing me, someone will post exactly the opposite information right after this!
