Do a web search for "DOS Network Client" - there is a ton of info out there.
You will probably need to install a hard drive, load DOS 6.22 on it, and the Client files.
You may have to copy the A:\ and the B:\ contents from the simdisk card onto the hard drive in order to free up a slot for the NIC card.
Edit the Autoexec.bat, Config.sys, and the Path.dat accordingly and then when you do a Files Load or Save, you will be accessing the server, not the floppy drive.
It is a fiddely process but not usually difficult.
Good luck, let us know how it works out.