First of all, thank you for your help. But I am still confuse, cause it never work for me? So I download the hg19 genome and add one line in the galaxy/tool-data/all-fasta.loc like this:
hg19(\t)hg19(\t)Hunman Feb. 2009 (GRCh39/19)(hg19)(\t)/path/to/download/hg19.fa
After I restart the galaxy, he still wouldn't let me select the genome fasta file