Cant save changes in job manager

It’s possible that there might be a javascript conflict.

Try disabling all of your plugins except WP Job Manager (and add-ons). Then try testing again to see if the issue persists. If that resolves your issue, you can find what was causing it by enabling each plugin one by one while continuing to test.

If that doesn’t help, you can also try switching to the Twenty Sixteen theme via Appearance > Themes, and test again. If the issue is resolved then you know it’s a problem with the theme, and you’ll need to contact the theme author for further assistance.