The reference was still pointing to Google, now it explains
the procedure with sourceforge.
Once a bug has been added to the tracker, you can comment it to add
more information about it.
-You may also mark the bug so that you automatically receive emails when
-any activity on the bug occurs. This requires you have a google account
-login.
+In order to be automatically notified about any activity on the
+tracker issue, you may subscribe by clicking the envelope
+symbol next to the issue title.
+Commenting and subscribing require being logged in with a sourceforge account.
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