1) At the top right corner of your browser, in the top navigation bar, under 'Browse', click 'Space Admin'. Only the user who created the wiki space has the initial right as admin to adjust the user permissions.
2) In the View Space Permissions page, click 'Edit Permissions'
3) You will then be allowed to add groups or specific users to modify their right to View, Create, Edit, Remove, Export etc. Just enter their group or NUS USERID into the text bar and click 'Add'.
Remember to click 'Save All' at the end of your session to save all changes to the User Permissions.