How do I enter my (upgrade) activation key when using trial?

supra2800

Bit poster
Hi,

Earlier today I installed Parallels 4 using a trial activation key (I have (had) Parallels 3 up until now), but now I decided to purchase the upgrade so I received my upgrade activation key.

Only thing is, I can't seem to figure out how to enter the upgrade activation key? I don't use windows that much and I would rather just get it over with, than having it stop working all of a sudden (during christmas I suppose).
 
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