If it is a word document, first sign the paper, take a screenshot, save the picture in the document, then set the text wrapping mode to float above, and then adjust the color, format and position.

If it's wps

First, open the WPS document and click the image under the Insert option.

After inserting the handwritten signature, click the picture, switch to the picture tool above, and click the color.

Set the color to black and white.

In this way, the inserted picture will be automatically adjusted to black and white.

Just move the picture to the right position and adjust the size of the picture.

You can also use ps software to put the name P on it.