There are three main methods to customise  company submission fields in WP Job Manager.

1. Basic adjustment by Enabling / Disabling fields WorkScout Core → Form Fields Visibility → Company Fields
2. Thrid party plugin such as https://plugins.smyl.es/wp-job-manager-field-editor/

Basic changes can be done in WorkScout Core → Form Fields Visibility → Company Fields where you can enable or disable fields you want in company submit form.

For text changes from english to english use plugin such as the Say What Plugin. If you’d like to translate fields to other language than english please refer to article: Translating theme and plugins →