Quite simply, you don't - not into DLB Caddy anyway. 

While you can enter IDs manually, it's recommended that you first 'show' DLB Caddy all the programs you have an ID for by visiting existing downline builders you've previously filled in manually.

If you do need to enter an ID, just enter it on the appropriate downline builder and then DLB Caddy will pick it up and save it for future use.