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Open Google Chrome. Tap the search bar. Enter a search term. Tap the IMAGES tab. Select an image to use. Tap ⋮ below the image. Tap Search by image. Review the results.
Tap the red, yellow, blue, and green Chrome app icon. It's at the top of the screen. If you don't see a search bar, first tap + in the upper-left corner of the screen. Type in the word or phrase for which you want to find an image, then tap Go (iPhone) or Enter or ✓ (Android). It's near the top of the screen, just below the search bar. This will display all image results for your search query. Tap an image that you want to use as the basis for your search. The image will open. Doing so prompts a pop-up menu. Don't tap the ⋮ in the top-right corner of the screen. It's in the drop-down menu. You should see a list of matching (or similar) images displayed on this page.