[galaxy-user] Adding a reference genome

Greetings, My apologies for a what is a naive question, but I would like to map NGS reads to a genome that isn't currently in the list of reference geneomes (soybean, Glycine max). To the guys at Galaxy - can this be added to the list? Or can someone explain to a bioinformatics ignoramus how I would install it in my history? Thanks for your help. Sincerely, Jeremy Coate