How can I create a “if ” Loop For arduino?

#1

Where i place the code for if loop Please help, When i put code in Code box its not working any extra code for it ?

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#2

Hi there:

Please click the link below and follow ths instruction,keyword:/{$BRANCH}/

FYI:https://www.yuque.com/makeblock-help-center-zh/extension-builder/create-arduino-device?translate=en

#3

The link you send to me, There is nothing is saying about conditional block.