You will need a crank extraction tool, there are different types for different cranks, you have to remove the bolt or nut from center of crank, then the tool scews inside the crank, it has a shaft which you turn using a spanner which pushes the crank arm off the spindle, its not too difficult if you get the right tool.
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You will need a crank extraction tool, there are different types for different cranks, you have to remove the bolt or nut from center of crank, then the tool scews inside the crank, it has a shaft which you turn using a spanner which pushes the crank arm off the spindle, its not too difficult if you get the right tool.
This repair requires special tools, take your bike to the local bike shop for assistance