afni.nimh.nih.gov

Dear AFNI users
Hi
I am trying to perform an one sample t-est on beta images(I obtained beta images for each subject using FSL) for 15 subjects(across subjects).
I have zero information on AFNI.
I know for performing a t-test in afni I should use a command.However,I dont know where to upload my beta images and customize the setting.
I will be more than gateful if you could help me on this matter.
Ps:Any tutorial is appreciated.

Thank you in advance,
Mahsa