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A conduit is a metal pipe that houses electrical wires. When wires are tightly wound through a conduit, a grounding wire isn't necessary -- as the conduit itself acts as a ground. (It's important to use conduit when running wires on the outside of a wall.)
Conduit benders will bend the metal of a conduit, or a 90 degree pulling 'L' can be used (image 1). It opens in the back, which creates an access point to pull wires through. Run the wires from the subpanel (image 2) to the pulling 'L' and then down to the junction box (image 3).
A junction box is an outlet box (also called a knockout box because of the circles in the sides of the box knocked out and removed in order to install a connector for the conduit). Use a conduit bender to shape the conduit so it will fit into the connector at the necessary angle. The conduit bender is pictured upside down in this example; normally it's operated on the floor.