Hello @LourdesGuallpa ...
Instructions for deleting your profile picture in Canvas can be found at:
- How do I add a profile picture in my user account as a student?
- How do I add a profile picture in my user account as an instructor?
If you are not able to delete what you want, a work-around would be to create an image on your computer that only has your initials on it, and then you can upload that image as your "avatar" to your Canvas profile. That way, you can display your initials however you like.
Hope this helps!