1. In Gallery, view the photo you want to write on.

2. Tap the pencil Edit button > Smiley button.

3. Now, you can go the Draw to write your text freely, or go to Text to type in the words you want.

To write on a photo on a Samsung Galaxy phone, you can use the built-in photo editing tools or third-party applications. Here's how you can do it using the default Samsung Gallery app:

1. Open the Gallery App: Open the "Gallery" app on your Samsung Galaxy phone.
2. Select the Photo: Choose the photo you want to edit.
3. Open Photo Editor: Look for an "Edit" or "Pencil" icon, usually found at the bottom or top of the screen. Tap on it to open the photo editor.
4. Access Text Tool: In the photo editor, there should be an option for adding text. This might be represented by a "T" icon or a text tool.
5. Add Text: Tap on the area of the photo where you want to add text. A text box should appear. Type in your text.
6. Adjust Text: You can usually resize, move, and customize the text. Look for options to change the font, color, and style.
7. Save Changes: Once you're satisfied, save the changes. This is often done by tapping on a checkmark or "Save" option.