SPSS General Linear Model syntax help

Hi everyone,
I'm analysing some data I collected from a preliminary experiment on muscle reflexes. Basically, I'm looking for differences in response times across 10 populations of deer mice. The populations inhabit two environment types and I tested males and females. So I've landed on a model like this:
Response=sex+population(environment type)

However, I'm not sure as to what syntax on SPSS to use to execute this. Alternatively, I may just be able to use SPSS GLM menu commands, but I don't know how. Can anyone offer some help?

SPSS challenged,