Choosing a job is easy! All you have to do is navigate through the ‘/menu’ to the jobs section (the diamond block icon) Or you can type ‘/jobs’. Once you have the Jobs UI open you can view info on the current available jobs.
You can currently have up to three jobs at one time. To start a job “right click” on the job that you would like to join, you can “left click” on any job to see more info. This GUI also has a list of helpful commands and allows you to see the currently top rated workers on your server. Alternatively you can use the command ‘/jobs join (job name)’
If you find that job isn't for you, don't despair, simply use the command ‘/jobs leave (job name)’.