Yes usually an association refers to the Condo Association for condos and a Homeowner's Association for a neighborhood of homes.
Installing mesh inside the wrough iron fence sounds like an issue that will need the approval of the association. Find out if you have an association and then write a letter asking permission to put mesh inside the iron fence. That way you have it in writing in case of any future isses.
Feel free to contact me with any questions or concerns. My contact information is below.