Here are the steps to add Winbounce script to a Jimdo website:
Step 1
Log in to your Winbounce account and the dashboard will be opened. Click Domain setting at the top of the page and switch to the Tracking Code tab. A code, that needs to be added to your website, will be displayed. And there will be a Copy Code button; click on it to copy the code.

Step 2
Login to your Jimdo control panel and select Settings from the left-hand side menu.
Step 3
Click Edit Head, paste the code you have copied, and save the changes.