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Saturate the affected area with water.  Let it sit until it's dry.    Repeat the treatment if the ink stain is still visible on your concrete.

Summary:
Mix 1 tablespoonful of ammonia with 1 cup of water in a large bowl to make ammonia water. Thoroughly wet the surface to be treated with clean, clear water. Saturate a piece of cotton batting in the ammonia water. Apply the cotton batting to the stained area. Pour scouring powder on the affected area. Use a stiff bristle brush to scrub the surface. Thoroughly clean and rinse the area with clean water to remove any residual staining. Dry the area with clean towels.