Change default cover photos

I’ve gone to the plugins theme file default/images in my cpanel and uploaded new images and renamed them to cover.jog and smal_cover.jpg. Refreshed the profile page and it still shows the Anspress logo.

( /public_html/wp-content/plugins/anspress-question-answer/theme/default/images/small_cover.jpg)

I also tried creating a “Anspress” folder in my site’s theme file with the two images, as suggested on another question.