InDesign is an industry standard application used for developing print documents. While many of these documents are used solely for print, many are converted to PDF for online access.
To make an Accessible PDF a degree of work needs to be accomplished within InDesign to achieve a suitable document for finalisation in Acrobat Professional.
Adobe offers a clear and comprehensive outline of the steps required.
Below are the basic steps required to create an Accessible PDF document from an InDesign file. Extended information is available in the links above. You will need access to the original InDesign design files and Adobe Acrobat Professional.
File > Export > Adobe PDF (Interactive)
Open the exported file in Acrobat Professional