I copied this from the Beersmith forum:
If you want to add a mash profile to a recipe - just pick the "Choose" button in the "Mash" section of your recipe Note that your recipe type must be "All grain" or "Partial mash" for this to appear.
The best thing to do to match your preferred profile would be to create your own custom mash profile in the "Mash Profiles" database, and then you can just apply that to any recipe you happen to be brewing by using the "Choose" button.
Here's a tutorial, though under the new version you can also enter your water/grain ratio directly which makes it actually a bit easier to build your profile.
I hope it helps, Beersmith is a fantastic tool IMO!