To record your calls, you'll need to enable Call Recording in two separate places:

Incoming Calls

Firstly, you'll need to enable call recording in your call routes.

To do this, go to:

My Dashboard > Voice > Inbound Settings > Routing  and edit your call route (blue pencil icon) 

You'll see a dropdown menu at the top labelled Call Recording. Set this as enabled.

Outbound Calls

Go to your Users tab:

You'll see near the lower right-hand corner there's an option to call record - check this so that Call Recording is 'on'.

That's all done! You can find all your recorded calls in Call History.