This is not helped by manufacturers making containers for the wormer who seem to think it is an easy job.
To start with I couldn't get the top off, but after nearly an hour of struggling, trying pulling it off and twisting it off, it was finally open.
So after a bit of a struggle finally got the syringe end on the wormer tube into the pups mouth pressed the end and waited.... nothing happened. So I pressed harder and suddenly it gave way and puppy was not so much black any more but more black with white splodges! (Just how did the wormer get all over her and me? It was aimed at her mouth).