3-way mixed ANCOVA set-up in SPSS

Hi there,
I am in need of some guidance on how to set-up and execute a 3-way mixed ANCOVA, with 2 between and 1 within factors. I am confident in my ability to run a 3-way mixed model ANOVA, however adding a covariate into the equation is something I am not familiar with. I have read some documents on 2-way ANCOVAs, however I am not sure if a 3-way ANCOVA is treated in the same manner.

My main question is, do I just add the covariate into the "Covariates" box, and interpret the results, or do I need to make further adjustments in the syntax editor?

Hopefully someone is able to provide a bit of insight.