Step 1: Hold your toy away from you and wait.
Step 2: Dogs are naturally curious, so when your dog touches it with his nose or mouth, click and treat. Keep doing this until he starts touching this toy without hesitation. If he isn't curious about this toy, gently tap his nose and click at the same time.
Step 3: Next time he touches this toy, click and treat, giving the command, "touch" at the same time.
Step 4: When he can touch toy on command, give him a jackpot, and make sure to praise him for his good work.