To enter license key, you need to source the correct license key from your purchaser/administrator. The license key is a string of text issued by Fluid PDF. Once you have license key, proceed to Step 2.
Open up Fluid PDF. Click Help on the top menu. Then click License in the drop down menu.
Once License menu is clicked, the license key dialog box will appear. Enter the license text into the input box and click OK.
Click Help on the top menu. Then click About Fluid PDF.