Hi xiao-yang,
There is a brief manual built-in toolbox that tell you how to begin with GRETNA.
You could also read the paper to know what GRETNA could do.
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4485071/
I am so sorry that it is a long time I don't update the manual,
especially about the statistical module (you could refer the DPABI
statistical module, they derived from the same GUI).
If you have some detailed problem, just leave me a e-mail:
sandywang.rest@gmail.com
Also I will try to update a detailed manual before 2016.
Best,
Sandy
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