Bishop plus knight checkmate… HELP!

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I can checkmate the king if the king goes to the edge. I understand the method and everything blah blah blah but the only issue I have is getting the king to an edge of a board, The king just lofts around in the centre of the board not doing anything. Please can someome help?

XOsportyspiceXO

Im glad iv not that on the board. But iv drilled it in the 100 end games course. Got to build a cage and walk the king to the same coulor squre as the bish. Its like a 30 move process. Knight had to controll the opposite coulor sqaure as the bishop.