You did not mention the battery or batteries, and how they are connected. This is important!
Most (not all) setups have the battery connected to the speed controller (ESC). The ESC feeds the power to the receiver on the same cable that the receiver also controls the ESC. You will need a "Y" power cable or jump across the motor terminals making a parallel connection.
For two motors the simplest way is with one battery, and one ESC (top part of the drawing). Connect the motors in parallel, + to +, and - to -. Connect the battery to the ESC and plug the ESC cable into the desired channel on the receiver. Make sure the ESC can handle the two motors current (best to use the stall current - amps at a minimum).
If you want to use two ESCs (bottom part of the drawing) you have to be careful. Check the attached drawing - if you use a "Y" signal cable you should cut the red wire in one of the branches so you ae not supplying voltage from both ESCs to the receiver. You will also need a "Y" power cable to supply voltage from the battery to the ESCs like above or use two batteries and wire them direct.
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