According to Leg Teaching Network, the specific operation of wps to modify the text on the picture is as follows:

1. Open the WPS document and insert the picture to be modified.

2. Select a picture and click the "Picture Tool" option in the menu bar above.

3. Open the picture editing window and select the text tool.

4. Drag a rectangular box on the picture with the mouse, and then enter the text to be added in the rectangular box.

5. Adjust the font, size, color and other attributes of the text to ensure that it is consistent with the style of the text on the original picture.

6. After the modification, click "Save" to save the modified picture.