afni.nimh.nih.gov

Dear Gang and AFNI users
Hi
Thank you in advance for your time.
I loaded ttest GUI by tyoing "uber_ttest.py".
However I do not know the other steps(like where should I load my images,...).
Compared to fsl and SPM ,AFNI is very puzzling?
Is there a step by step tutorial or.... for this?
many thanks,
Mahsa