You'll have to examine the script attached to your "change" button. That isn't a standard FileMaker feature then or now so I assume it's a button added to your layout by a developer that performs a script.
The rest of your description is a bit confusing. "Load records"? what do you mean by that? You appear to have more than one file--often the case with older versions of FileMaker due to the limitation that you can define only one data table in a given file, but you don't tell us what files you have nor how they are related.
Even the proces of "making a new record" is something that can vary greatly depending on the design of your database.