Momentary Button for Project Power?

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i have arduino project , have drilled holes not knowing switch have momentary button needs turn on arduino , continue supply power board 1 pressed.

      button has 5 pins: open, closed, common, , 2 +/- led. i'm unsure how use momentary switch complete circuit , keep arduino powered on. problem being momentary switch momentary , therefore stop supplying power when button isn't being pushed. arduino have off entire time until switch hit can't monitoring it.

many switches available in momentary or latching versions, need latching type.

show details of switch have , might able suggest suitable latching 1 fits drilled holes.



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