how to add image to my signature?

Hello!

I hope you are doing well, and thanks for reaching out.

We'd definitely try to help and make your experience better here. I believe you are working with anyone of the Adobe products, as its either Adobe Acrobat DC or Reader DC. Adding images as a signature to PDF is quite easier. Just follow these steps-
1- Open Acrobat/Reader DC>Open a PDF
2- Select the Fill & Sign tool
3- Click on the "Sign" icon at menubar at the top
4- A drop down will appear with two options "Add Signature" and "Add Initial"
5- If there's anything already added, then remove that first (-)
6- Now click on the (+) icon to add an Image.
7- A small window will appear to have 3-options there, Type, Draw, and Image.
8- Select Image and Apply.

To understand this with Screenshots, once go through this help article: https://helpx.adobe.com/acrobat/using/signing-pdfs.html#sign_a_pdf

Let us know if that works for you.

Regards,

Anand Sri.