How to get old pedals off to fit new ones

Hello everyone,,
How do i get the pedals off of my bike to put on my Shimano clip ins! Sorry i am new to this!

Thanks......

 

Depending on the exact pedal either with a pedal wrench in most cases or in case of the high level pedals, a 10 mm Allen wrench from the crank side. Pedals ALL tighten opposite their rotation so that pedaling the bike always tightens them. So one side unscrews clockwise and the other counter-clockwise.

 

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Thank you my issue has been solved,.....

 

Some pedals have tool flats on the pedal spindle, just outboard the crank arm. Others have a recess for an Allen key on the inside.
Remember that the left pedal has a left hand thread.
Pedals (generally) tighten while riding, so they can be wickedly tight.

 

A little grease on the threads helps to later remove the pedals.