# Interpreting significant interactions when single effects are not significant

I am fitting a linear mixed effect model to my data, and I get the following results I cannot interpret.

I have two main effects (Force and frequency) and one interaction (Force:frequency). The Force main effect is significant ($p=0.046, \beta_F=0.004637$), the frequency effect is not ($p=0.243, \beta_f=0.99724$), and the interaction is ($p=0.038, \beta_{Ff}=-0.0060714$). I am not sure how to interpret this.

My understanding is that frequency let the effect of Force decrease. However, at which level of frequency does the effect of Force become non-significant?