You can edit and create your job descriptions by going to the 'Jobs' section of your system setting and selecting 'Job descriptions'.
After naming your description, adjusting the colour scheme and filling out the necessary information, you can scroll down to the bottom of the page and enter any skills you wish to associate with the description. Once complete, ensure you click 'Add job description' in order to save the description or any changes/edits you've made.
What is this used for?
This can be used to show office staff which engineers will be best suited to the job they're booking in.
Can I edit the skills later?
Yes, you can complete the actions above again, and change the skills associated with the user.
Can I add more skills to this list?
Yes, you can add skills by going into System settings > Skills. You can view this article to see a walkthrough: Add job/user skills.