The front user profile plugin templates can be easily overridden in the child theme by copying the template files from the plugin folder to the child theme like in the example below :
Example, copy the next file :
-> to the child theme in below location
And for the second one wp-content/plugins/front-user-profile/templates/components/author-box.php
-> to the child theme in the below location
Make sure that you have the child theme installed and activated.