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If it's alrady smiling, just hone straight.

Ivo, putting a bit of pressure on the heel and the toe will give a smiling edge. Honing the middle will give you a frown.

I'd offer to help but I never hone in this room (just not a good setup) and I only have one smiler, and haven't touched that one in ages. I am actually applying this technique for my straight edges...

I wanted to specify something. The rocking motion that MP mentioned is heel to toe and not spine to edge. Just slight pressure variances. I recommend a Skype honing session with X or Randy Tuttle....