how to start this private test ?

Hi, how do I start this function ?
I want to test if my internet connection ok before he gone make connection to the api database
(he do this 24 h in a time loop)
I put
call CheckConnection
but he said ' can not find"

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Or should it not be a private at all (found on the code on this website)

Thanks
Chris

Thank you men

it works now ;-)

great !