You can set the theme to only allow registered users to post a job or a resume by going to Job Listings > Settings > Job Submission > Account Required check the box to only allow job postings with registered accounts.
How to Disable/Enable Popup Functionality on the Sign-Up/Login Links in Jobify and Listify Themes
How to Use the “One-Click Demo Import” Plugin for Jobify Skin Demos
Setting up Contact Form 7 Plugin with Jobify Theme for Job Applications
Different Subscription Types When Using Payment Packages
How to Create a Job Package and Job Subscription Package
How to remove/hide the Related Jobs Widget