Do I need to copy all files (templates) or just single_job_listings.php?
Just the one file.
And also, do I have to delete all the content from that box (in content-single-job_listing. PHP template) and write new content?
If you’re only displaying a few fields, probably start from scratch.
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No idea what you’re doing. You should be copying these files across, and creating the directories, via FTP.
Ii know ur probably sick of me but I was wondering do I need to change anything in job-submit.php, because that template looks like the one on the POST JOB page.
Up to now I’ve been telling you how to customise the actual display of a job. If you want to customise job submission fields:
There are three ways to customise the fields in WP Job Manager;
1. For simple text changes, using a localisation file or a plugin such as https://www.ads-software.com/plugins/say-what/
2. For field changes, or adding new fields, using functions/filters inside your theme’s functions.php file: https://wpjobmanager.com/document/editing-job-submission-fields/
3. Use a 3rd party plugin such as https://plugins.smyl.es/wp-job-manager-field-editor/ which has a UI for field editing.
If you’d like to learn about WordPress filters, here is a great place to start: https://pippinsplugins.com/a-quick-introduction-to-using-filters/
You may want to consider posting on jobs.wordpress.net if you want a developer to take care of all of this for you.
Good luck anyhow.