To start a tutorial
download a model from the tutorials or copy a model from the tutorials folder in the CCMSuite folder
put it in the CCMSuite directory
open Python
from the Python menu open the model you chose
from the Python menu, run the model
Once it runs, try making changes to see how it works
generally it's a good idea to save your new model under a different name
If you are new to ACT-R we recommend starting with the Basic tutorials