Gardening experts-some advice about amending my soil..?

I tested my soil(for a vegetable garden),the ph and potash came out fine,the nitrogen and phosphate was extremely low.I went to a garden center and they gave me Epsoma dried blood(12-0-0) and triple phosphate(0-46-0).I did not think to ask about details of how and when to add to the soil,because I figured directions would be on the bag-they weren't,and they weren't on the website either.It's hard to get in touch with the garden center at this time of year,so I could use some expert advice about when and how to add these to my soil.I live in zone 6.

I would like to know if someone could tell me the proper method and time to put these in my soil.Thanks in advance!