The fuses already on the board are for reverse battery protection and maximum load, if I understand your question you’re asking about the branch dc circuits.
There are twelve branch circuits running up and down in the center of the panel, the factory doesn’t install fuses in them so all you see are the terminals on the board that the fuses plug into.
There is a place to attach the wire to next to each fuse holding terminal pair for that circuit on the back of the board, then you have to install the proper size fuse for that circuit.