Unassigned iqandesign 7

So I am totally new to this. I  used the Tools drop down to add some signals from the CAN j1939 database, seems to show the signals I expect and I can see them in my project, can use them etc etc. However it says they are 'unassigned'. Searching shows lots of ways to 'assign' them for all sorts of older versions of IQAN which dont appear relevant in IQAN 7 - for example I cant find the 'application logic' screen apparently in 6.03 but have found system layout which allowed me to create a module and drag and dropping from my application window to that seemed to allocate all bar TC1. Any idea why this fairly difficult to find a description of doesnt work for TC1? 

I am sure the system is really good once you get to understand it all, just learning so bear with me while I suffer as I always do with something new  :0

Thanks in advance.