You have to put this label on the net connected to F<0:529> pin of your block.
This notation (f<0>,<*529>GND) means first wire of bus is connected to net f<0> all 529 next wires of bus are connected to GND.
It is equal to f<0>,GND,GND,GND,…,GND. The number of entries separated by comas are equal to bus width (simple one to one connection).
Back to your first post. In attached schematic You have an error because to pin F<0:529> which is a bus with 530 nets, You connected 530 wires of bus f<0:529> to which You made a connection of 529 wires of the same bus f<1:529> and everything is shorted by single wire f<0>.