its because i want to change a courses to a earlier time

You go into SOLAR and click "modify" in the drop down menu to the left of the Subject. Then you will get more drop down menus to the right of the Subject where you can pick different timings if they are available. You can change Cores, Labs and Tutorials if more are offered and if they are available.

If a different section is "full" just keep trying. They do open up eventually.

Originally Posted by 737300173

its because i want to change a courses to a earlier time

Firstly, check out the McMaster Master Timetable to see available times for Cores, Tutorials, Labs https://adweb.cis.mcmaster.ca /mtt/

Then Log into Mugsi, then Solar and continue and you will be able to modify courses, times etc...providing they are still available and not full.