Ok, so building on these two levels of training, level 3 (advanced) introduced the REFramework. The key concept of this is using two separate processes. One process (the dispatcher) is used to do any pre-processing of the items and add them into a queue. for example, reading an excel, filtering out any rows you don’t want to add to queue and then adding the remaining items.
The other process (the performer) is used to then do whatever actions you wish to on said items. Hopefully this now makes more sense.
However, for THIS demo you do not need both processes and it asks you to create it in one whilst still referring to dispatcher/performer, i appreciate this adds confusion. To begin with you will want to read the excel file and add the items to queue for each row, there is an activity you should be familiar with to do this
pages 1 & 2 walk you through this.
Inside the framework you will see a number of “invoke workflow” activities. this is where the main process work will be occurring. open these workflows and see what they currently do/are meant to do,sometimes the clue is in the name. Inside of these workflows is where you should put your process work. an example of this could be the InitAllApplications workflow file. this will involve opening and logging into any applications you wish to use.
Hope this makes more sense now? i appreciate the step up is quite steep from level 2 to 3, im working throughout the day but if you ping me on here i can get back to you if i get some free time 
JC