Hello Wendy,
First,you need to open a new processFlow:

It should open an empty space and when you click on it, your library will become processFlow library, to get to the standard 3D library you just have to click on your 3D view.
Then you will look for the elements that you need for the processFlow>
An schedule source: this will create your tokens.
Delays: these will get your tokens for a certain amount of time. is equivalent to a processor in 3D.
A custom code with the reference to stop the conveyor I showed you on the previous answer.
A custom code with the reference to resume the conveyor, very similar to the stop object element but with a resume option.
To connect the processFlow commands you can push them together and they will stick together automatically.
To connect the processFlow commands with an arrow you just need to put your mouse in the border of a command and then click and drag to the next element.
To change the variants of the different commands (like the cycle time for the delay) you can single click a command and modify the variables in the quick properties menu.
With this you can create the processFlow I showed you on the previous answer. If it does not work let me know and I will help you.