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1. Click Edit for the workflow that has the transition you wish to add the post-function on.
2. In the Workflow Designer, select the transition.
3. Click on Postfunction in the properties panel.
4. Click on Add postfunction.
5. Select Update Field / Custom Field Value Postfunction from the list of postfunctions.
6. Click on Add to add the postfunction on the transition.
7. Fill the form shown below and press 'Add' button.

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Fields

Custom Field – The source field which you want update the value.
Value – The final value you want to update.

User – The user who will be used to update the field

You can also type some variables to set a dynamic value:

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