Create a Job Tag
You can create a job tag by opening any job information page in your database (Note: this does not have to be the job you want to add the tag to), and clicking on the diagonal pencil icon to the right of the Job Tags drop down.
This will bring up the Job Tags pop up, where you can edit a job tag by clicking on the diagonal pencil icon to the right of the job tag, or add a new tag to your database by clicking on the '+ Add' button in the upper right hand corner of the pop up.
Clicking on the '+ Add' button will create an empty tag space where you can type in the name of your new tag, and then select the check box to the right to save it to your list. If you opt out of adding a new tag, you can click on the little x icon to cancel the action.
Note: You can also delete a job tag from your database by clicking on the trash can icon to the right of the job tag, but this will pull that tag off of every job in your database, so you will want to be careful when making your selection.
Add a Job Tag to the Job
To add the job tag to to the job, you will want to be on the job information page of the job you would like to add the tag to, click on the Job Tag drop down above the service listing, and select your job tags of choice. This will drop them into the jobs job tag section, allowing you to click on the orange Save button in the upper right hand corner.