Debra, I don't have a wizard so I don't know from experience, but someone on the Atari forums explained it this way:
"If I have an Arcane wizard scroll, I have my Wizard cast Read Magic on the scroll (not Identify). This tells you what the scroll is. Once it is identified, if it is arcane, you should have a Copy Scroll option in the Radial Menu somewhere. If you dont find it, look again. It may not be where you expect it. Anyway, once you select "Copy Scroll" a Spellcraft check is made and if you succeed, you've added the spell to your spellbook. If you fail, you wont be able to successfully try to scribe scroll again until your spellcraft skill increases by at least 1 ... which will be the next time you level up. This works both for PCs and NPCs. My party has Spugnoir as my only Wizard and he gets all the arcane scrolls. I make him read magic on them and Copy them.
This implies that for a Wizard, Read Magic (Spell) and Spellcraft (Skill) are vital."
Hope that helps.
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Playing: World of Warcraft; Geneforge 3