If you select option R, you must specify a partitioned data set and member name. You must also specify a new member name in the "New name" field. Option R prevents you from renaming a member that is currently being edited by you or another user.

Where the data set refers to a partitioned data set load library (RECFM=U), and the member to be renamed is the name of an primary member, the user data component of any associated alias names will be updated to refer to the renamed primary name.