Hello @waynep16,
Please go to the following templates and change the label of “Attach Resume”. Please do not modify the plugin core files, use the SJB templating feature.
simple-job-board\templates\v1\single-jobpost\job-application.php
simple-job-board\templates\v2\single-jobpost\job-application.php
v1 is for classical layout and v2 is for modern layout. Please modify template as per you Settings> Appearance tab.
For templating, please visit the plugin page and see the templating & configuration section.
Feel free to write us if you need our further assistance.
Regards,