To add a job on mobile you need to be a scheduler or a technician with permission to add jobs on mobile. Admin can enable this in Settings - staff.
How to add a job on mobile
1. Click on the orange + to add a new job
2. Select a site (customer) or click add customer to add a new site
3. Add job details as needed, project, date, time, job type, units and technicians, depending on your business you might not see all these options.
4. Click save at the bottom to save the job
Allow a technician to schedule jobs
In Settings - Staff click on the technician that you want to allow to add jobs. Check the Allow to schedule job on mobile checkbox and click save. The technician can now schedule jobs on mobile.