After extracting (Windows, Mac) your iPhone's WhatsApp archive (ChatStorage.sqlite) you need to move it to your new Android device. You need to put it inside the (auto-created) WazzapMigrator folder, like this.
If you can't see the auto-created WazzapMigrator folder just restart your phone.
Please note that WazzapMigrator will search it in other folders too, like Downloads folder.
Or you can select it manually: