Hello Yang,
Here's a chunk of my .cshrc where the path is specified.
set path = ($path /home/ziad/abin ./)
after you modify your path, you should run:
source ~/.cshrc
rehash
By the way, some people do not like having the ./ in their path. After all, you should not be creating new files where @SUMA_Make_Spec_FS (who creates these names?) resides. But you should certainly include in your path the directory where all of AFNI's prorgams and scritps reside. On my computer the programs reside in /home/ziad/abin (see path example above).
cheers,
-z