This will depend on the type of development solution that was implemented on your site, which is defined based on the project needs. If that section was predefined to be dynamic, there would most likely be a control panel you can access to add and manage these information. If what you need to update is a completely new section on your site, you most likely would need to rehire me or other developer to create it.

At the beginning STRATEGY stage of the project, this will be defined and clearly planned based on your needs for the development solution. Click here to learn more about process.

Also, please read this answer that could help you, otherwise please contact me.