Old case, new mother board

I recently got my moms old desktop computer and replaced all the insides. new power supply, cpu, ram, added a gpu, and a new mother board.
the mother board dosnt have a place to plug in the power buton on the front of the tower. how can i work around this?

the power switch connector from my case (17 pin) dosent fit my new motherboard. the MSI h81m-e33. how do i work around this?

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