homoscedasticity violated in more ways than one?

#1
Hello I need some advice, I am using multiple regressions in SPSS. My data is not entirely normal in its distribution but not bad enough to make me wince with fear. All my variables are measured upon a 1-7 likert scale. However upon running my regressions I am getting two problems, one of which may be my own doing, so Ill start with that one.

I have been told I need to control for a variable, because it is theoretically bipolar to one of my predictors. So where in the model should I enter it? can I use stepwise still or do I use the 'enter' function to force it through?

Secondly is the residual scatter plot is strange must be violating but unsure of how to interpret or correct it.

Thank you

Tony