Get on with it

At a toy factory

Worker: You're meant to take a time card, put it in the clock, like this. Then push
down on this, and it stamps the time on your card.
New worker: What time?
Worker: The time you which started work which is now 10:30. So, get to it.
New worker: Well, what do I do?
Worker: Stand at the assembly line.
New worker: How do we do that?
Worker: It's dead easy. Watch me, I start by putting the square blocks in the square holes.
You'll soon get the hang of it.
New worker: Get the hang of it?
Worker: Get used to doing it. Get on with it.
New worker: OK. I'll put some more square blocks in the square holes. Da, da, da, that's fun.

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What does "Get on with it" mean in this dialogue?

Thank you