How to do a comparison of three groups for dynamic functional connectivity GIFT

Hi everyone.
Recently, I was doing dynamic functional connectivity at the network level through the GIFT software, but I found only the option of two-sample t-test when comparing at the back, and I saw the related article that it is possible to compare between three groups, and I would like to know how to do it specifically.
Another question is if I have two groups of subjects, each with a pre and post intervention, how should I set up folders to put data when I first run ICA
Looking forward to your replies, appreciate it!