To input the Hulu activation code on your computer, open a web browser and visit the Hulu activation site by typing "hulu.com/activate" into the address bar. This will take you to the Hulu activate page. Sign in to your Hulu account if prompted. Once signed in, you will see a field to enter your activation code. Input the code you received on your device and click "Submit" or "Activate." This process links your device to your Hulu account, allowing you to stream content. Make sure to complete this within the timeframe specified in the code instructions.