i am trying to organise my timetable using the new timetabling system, however, all my class timetables show as 'read only' and i cannot actually chose classes/allocate.
Two of my four classes have automattically allocated, where as the other two still have the '!' and say that i am not allocated.
You don't need to register for classes where you're auto-allocated.
For full details about when and how and when to create your higher ed class timetable go to https://www.rmit.edu.au/students/student-essentials/program-and-course-information/class-timetables/....
There's also an instructional video.
Sounds as though you need some more personalised help with this one. Suggest you log an enquiry via the RMIT Connect portal at https://rmit.service-now.com/connect/. You can also call them on 9925 5000 if you need immediate assistance.