2009 Macbook, Intel Core 2 duo, 2.13 GH. 4GB RAM. Used refurb, running OSX 10.5.8. The Apple.com site says I need to be running 10.6.6 or something to install Lion. I already bought Lion for my iMac. Does that entitle me do put a copy on this Macbook and if so how? Thanks in advance, I'm new to the Apple culture so pardon me if I'm a little slow.