Ram does not come in single/dual/triple channel.
It operates that way, depending on how many sticks you have and your motherboard' capabilities.
If you need more ram, add another stick, assuming you are currently populated with only a single stick.
CPU-Z will tell you that. Or, you can open up the case to verify.
If you add a similar stick with the same speed, voltage, and latency, you should be OK.
Or, go to a ram vendor web site and access their upgrade configurator. Enter your PC and they will give you a list of compatible upgrades.