1. Open the main page of iphone 6, find the memo and enter. As shown in the figure.

2. select new memo in the lower right corner of the memo. As shown in the figure.

3. After entering a new memo, select+Add Tool at the top of the input method. As shown in the figure.

4. Add option pops up and select photo gallery. As shown in the figure.

5. Select the desired photo in the photo gallery and click on the top right corner to finish. As shown in the figure.

6. Return to the memo and add the custom picture background successfully. As shown in the figure.