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While waiting for the anime, you can also click on the link below to read the classic original work of " Full-time Expert "!
Adding 4 pics in a story can vary. Sometimes, you need to click an 'Add Image' option, and it'll open a window where you can choose the 4 pics from your device. Also, some apps or websites might have a drag-and-drop feature. Just make sure the story layout can accommodate the pics nicely for a visually appealing presentation.
You can use photo editing software like Adobe Photoshop or free alternatives like GIMP. Open both pics, resize and position them as you want, and then merge the layers.