how to configure system clock in micro vision 5?

i,m new in using stm microcontrollers. i,m using STML152 Nucleo board. i,m doing blinky project and i,ve seen several projects in which they taught us about configure system clock. So, when i,m making my project i can not find the lines for system clock in configure files. i,ve seen reference manual document of cortex m3 in books tab but i could not find detail of system clock.

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