Can't activate Asset Optimization

Hi,

I am trying the Hummingbird plugin on one of my websites. I might have done something stupid by mistake.

I activated the plugin and ran the test. Asset Optimization worked great. When I was exploring all options I went into Settings and I believe that I accidentally clicked

Deactivate
No longer need Asset Optimization? This will completely deactivate this feature.

Now whenever I try to activate the Assistant the test completes but the feature is never activated and I return to the Get Started page.

Could you please let me know how I can fix my mistake?