How to convert a Pedigree Only animal to Active
Step 1:
Highlight animal(s) you want to make active (you'll need have Include Inactive, found at the bottom left of the screen, ticked in order to see Pedigree Only animals).
Step 2:
Go to Utility > Bulk Changes > Basic Animal Details
Step 3:
Highlight Convert Pedigree Animal to Active and then click, OK.