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How to do polynomial fit in Standard Least Squers?

I need to use second order polynomial fit in fit model - Standard Least Squers. Just like the regular fit X by Y. I tried to use Macros--> Polynomial to degree and have 2 in the box degree. I get a very high R2, so I'm not sure this is correct. Can't use the regular fit X by Y because I have a random effect to put in. Is this the right way to do that? could it be that the R2 is realy so big, or am I doing it wrong? Just trying to get the U shaped graph I'm supposed to get...

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