After you created a child theme, you need to copy the class-agama-helper.php file into your Framework folder in your Child theme (Path should be: agama-pro-child/Framework/)
To do that, please follow the next steps:
1.Install and activate the “File Manager” plugin (Dashboard->Plugins->Add new) https://prnt.sc/px9a5t
2. Using the File Manager plugin, Create the “framework” folder in your agama-pro-child folder then Copy your modified class-agama-helper file in it.