I was able to solve my doubt 
I decided not to delete this post because someone might be looking for the answer.
If you follow these steps you will get WGCNA in Galaxy Rstudio:
1- Go to TERMINAL and type: conda install -c r-wgcna
2- Go to Tools in the Rstudio panel → Install Packages → Repository (CRAN), complete with: “WGCNA”.
3- Accept the terms and update the associated libraries and WGCNA will work correctly.
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