One of them is Equations and the second one is Symbols. Position the insertion point in the right-hand column then click on the Align Right tool on the formatting toolbar. Then click the Equation button in the Symbols button group.
The ribbon is the horizontal menu between your document title and the document.
Choose Field from the Insert menu. Alternatively to manually insert and create an equation in Word place your cursor at the insertion point in your document. Select the Insert tab on the ribbon. On the Word Options dialog box click Proofing on the left and then click the AutoCorrect Options button in the AutoCorrect options section on the right.