Login with the same details as for your student email account.
Find My Timetable, which will still be empty.
Click on +Add activity.
Add modules in List Type.
You can find and add modules in 2 ways.
Per Module, make your own private schedule with modules from different phases and specialisations.
Per Programmes of Study, this automatically selects all the modules relevant for your specialisation & current Phase. After adding all modules for a Programme of study you can always select single modules to add on top of that.