Choose your Preset. Make sure the check boxes next to "Create Tagged PDF" and "Hyperlinks" (if you have hyperlinks) are check. Choose Export Button.
Step 2. Open Adobe Acrobat Pro
Exporting to PDF does not guarantee the PDF is completely accessible. You should always check the PDF in Acrobat PRO make sure the tags have carried over appropriately. To check your PDF, open it in Adobe Acrobat PRO (not Reader). Check the reading order and alternative text of your document. You can make adjustments necessary in Acrobat Pro.