Mantis Bug Tracker - Forums

Hello, I´m new to the platform and to php programming, and I would need to add an extra field in the "Notes" form (I already incorporated it into the database example "EXTRAFIELD") but I don't know where to put the code and I don't understand what to put either. If someone helps me it would be super productive. Thank you.

Such kind of customization is typically done by writing a plugin.
To get a first general impression what it means to write a Mantis plugin, look at the plugins at https://github.com/mantisbt-plugins

This one could be a good one to start https://github.com/mantisbt-plugins/timetracking