If you use Development Hub as a standalone product, use a Linux/UNIX-based editor such as vi to edit your COBOL programs.
If you use Development Hub in conjunction with Visual COBOL for Eclipse installed on a local development machine:
Once a connection is established, from your local Visual COBOL you can open individual files on the remote machine or create remote projects for the source code on the remote machine. Then you can take advantage of the fully-featured development environment and the advanced features for editing, compiling and debugging to change or maintain your COBOL applications.