Using WorkScout and WP Job Manager, candidates have different option to apply for jobs.

Method 1 – Default

By default the popup shows only email of the Employer or the email provided in Job details, you can also set external URL for application which will open external website set in Job details by employer

Method 2 – WP Job Manager Contact Listing

By using this plugin you can use one of plugins: Gravity Forms, Ninja Forms, Contact Form 7 to display contact form in the popup – instructions how to set each one are here https://wordpress.org/plugins/wp-job-manager-contact-listing/faq/

When you have the forms, you can choose in Job Listings → Settings → Contact a Job Form – which one should be displayed in popup

Method 3 – Resume Manager add-on

Using Resume Manager add-on from WP Job Manager, Candidates can send the Resume they’ve submitted as an attachment to the Employers email.

Method 4 – Applications add-on

This add-on allows candidates to apply to jobs using a form & employers to view and manage the applications from their job dashboard. There’s also a form builder which helps you build custom
“apply forms”