To create a Queued Job, in the Web Portal go to Jobs > New Job > and in the Assign To field select Queue and the user group(s) that are able to accept the job.
You can also set an already created Job to Queue, by going to Jobs > Jobs List > select the Edit arrow for the Job and in Assign to select Queue and the user group(s) that are able to accept it.
In the App the queued job can be Accepted, Rejected and Rescheduled by swiping to the right on the job screen. The process of completing a job is the same as a job normally assigned to the user directly.