From your dashboard, click in the upper right on the dropdown menu below your name, and click on Account.

Next, click on Security Questions.

Next, from the 3 dropdown menus, change your security questions and update answers.

When you've updated your questions and answers, click Save.

You'll see the following Profile message, and you'll click Close.
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You can continue working in the Helper. Your security questions (and answers) are updated! Good on you!