How To Add A Link To A Picture
In Google Slides
Open your Google Slides presentation and select the picture you want to add a link to.
Click on "Insert" in the top menu and choose "Link", or press Ctrl + K (Windows) / Cmd + K (Mac).
In the pop-up box, enter the URL you want to link to.
Click "Apply", and the picture will now be clickable.
To test the link, hover over the image and click the link preview.