You can register a boar/semen through the path:
Management> Brreding Herd> Data entry> Boars> Purchase > Add
Click on the Add icon 
It will appear the "add purchase" screen
All the mandatory filling will be advised by the *, all other fills are complementary and optional.
After filling all the data just click on the "save and close (if there is no other entry to add) or Save and continue (to add another boar entry).
The bith date must respect the "rules for male entry" settings.