Click the 'Install' Button:

Click 'Continue': 

Click on your FGSD Google Account or Enter your FGSD Email Address:

Click the 'Allow' button:

Navigate to your Google Slide

Click on 'Extensions' from the Menu Bar:

Click on 'Slide Translato':

Select 'Translate': 

A pop-up will appear on the right column of the Google Slides window:

Select the Current Language of your Slideshow:

Then select the language(s) you would like to translate the slideshow into:

Click the 'Translate!' button:

The translation process will take a few moments, then click on The language you translated into:

Now the slideshow (Max 3 slides for Free) will be copied and translated in the new window.