How do I insert a picture into Google search?

You have to follow these steps to insert a picture into Google search.

Search for your picture using Google Image Search, and save the URL of the search results page that lists the image. (You may need to log in to your Google account before you can use Google Image Search.)
Copy the URL from the search results page to your clipboard. Click on the text box and paste the URL in the Address bar. The image will appear.

You can copy the URL and past into the address bar to quickly insert the image.