Can you provide more information about the other variables you are analyzing?

Mainly if both variables in your moderation are continuous or if one is categorical. 

You, mean this one

Y = B0 + B1X1+ B2X2 + B3X1*X2

If x1 main Effects then B3 signifikan & positif: it mean x1 Will more positif (gap among x1 &  x2 become higher) if If x2 increase (positif).  If B3 signifikan & negatif : it mean x1 will more negatif If x2 increase (positif) 

My Dear

Moderate analysis  it is used when  y=f(x1,x2) , x1=f(x2) then is this case we can used

Moderate analysis  or Mediation  , you can see this ref.

 Hayes, A. F. (2013). Introduction to mediation, moderation, and conditional process analysis. New York: The Guildford Press.

both are continuous variables