Hi, 

I am using local Galaxy on my computer. I would like to use megablast but I don't know how to add wgs and nt database to local galaxy (I am new to galaxy). 

1. Where can I download those databases (if you dont mind, can you give me the link?) ? 
2. How can I add those databases to galaxy?
3. What if I want to do BLASTN instead of megablast, how can I do that? 

Thank you very much,