Wow, I haven't used a keyboard like that since IBM days in the late 80's. Do you have the documentation re programming function keys? If not, maybe
http://xkeys.com/assets/manuals/manxkps2.pdf
You would have to work out the entire keypress sequence first & write it down. Forgetting the sequence during setup is a pain.
Does yours have a Windows key? Then W+R, run dialog should open with all text highlighted. Enter the path to the db and press Enter and what was there should be over-written.
No W key? Ctlr+Esc+R. Start typing and you may see the path being entered into the search dialog. This may be pc model dependent. I was able to start Access by typing MSACCESS.EXE on HP laptop.
That's all I can come up with for where to enter the db file path when programming the function key.
The more we hear silence, the more we begin to think about our value in this universe.
Paraphrase of Professor Brian Cox.