In most places where you are able to set a value in NodeCanvas, like for example within Tasks or Nodes, you will encounter what they are called BBParameters. BBParameters allow you instead of setting a value directly, to rather link a Blackboard variable instead. This is a very important feature to remember.
This is done by clicking on the radio button on the right of the parameter and a dropdown list will appear.
There are four possible choice you can have within this dropdown.
When you have selected a variable this way, you will notice that the information written relevant to that task and that variable will come with a “$” token in front of the name of the variable. This is always added to indicate that this name refers to a variable and thus not to be confused with it being just a string.