How to connect message flows between 2 pools?

I am using the community edition and cannot make connection between 2 pools.  The flow section of the Pallette only shows one type of flow “transition" and I cannot connect a message from a pool task to another pool,  
 

 

Hi,

in order to connect 2 pools, you will either use call activities or BPM messages. The following blog post explains you how to use them.

To link messages, you are going to map the message content. A doted line will appear to illustrate the link between your pools.

I hope this helps.