Blueprint Topic Publish Example

There is no “Publish” option available. Please find the image below. The only options available are “Subscribe”, “Publish String Message”.

The Topic.cpp file does have Publish function. So, I am not sure why it is not visible in the blueprint. Could someone please post an example for publishing on a topic through blueprint? That would be helpful. Thanks!

Look this; https://www.gameplaydeveloper.com/unreal-engine/