i keep getting this message

Sorry, you are not permitted to use that image as a personal photo as the extension isn't on the permitted list.

i take the photo i want to use and upload it with imgur

what am i doing wrong ?

Most likely its over 100kb size limit, if not make sure its png/jpeg format

Make sure you are using the direct link to the image, otherwise you will get that error.

Example of indirect imgur link: https://imgur.com/gYM0yDK
Example of direct imgur link: http://i.imgur.com/gYM0yDK.gif

Right-click the image, and select "Copy image address" to get the direct link.