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At the Touchstone log-in screen, select the 'Not registered?' button. Fill in the following form to create an account and follow the instructions to verify your e-mail address. You should now be able to log in to the wiki space and see additional options on the top right of each page.
Additionally, if you have an MIT Kerberos account, you may log in using that when prompted with the drop-down menu.
To get started, you may wish to visit the Creating and Editing Content page for information on how to use the wiki.