It's necessary to open a port on your router for an application or service when you want to access it from outside or you want that application to communicate with other servers. If you are not instructed to open a port, then don't do it since you'll be opening a door for all the people.
You should always contact your supervision or IT Administrator to ask for advice when you want to do these operations.
Additionally, check the HELP documentation for the software to see what are the necessary ports that need to be opened.