Just click on the little tree, not the big trunk, and you should be given the option to use the scroll, you don't need to (or can AFAIK) use the scroll from your inventory. The tree will disappear and be replaced by a portal.
I don't know if the spell on the scroll is a real spell in PnP, but it doesn't exist in NWN as a selectable/memorizable one, only on that specific spell scroll.
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Nothing is impossible, it's just a matter of probability.
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