Pick which ones you want from the box, once you're finished, and you used all 50 points, you will get the Blacksmith's Blessing.
However if you've got a few points left, you're able to click 'End' which is on the menu also. Clicking End will terminate your box and give you the Blacksmith's Blessing that you picked.
Note: Make sure you have enough inventory space when redeeming Blacksmith's Blessing from the SRT box.