I am trying to power an Arduino nano connected to an LCD screen. I want it to work without connecting it to a computer. Please let me know if the connections aren't clear in the photos. I have a 5 V regulator and a 9 V battery, would that work? If Vm
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Just connect the 5 volt regulator to the Arduino, ground, 9 volts and that's all. As long as you are not pulling too much current through the regulator everything will be okay (too much current means about 0.75 A so you will have no problems with your LCD - the regulator will start to heat up). If you don't know how to connect your regulator than here: How to Connect a Voltage Regulator in a Circuit
I use it without any additional components and I have no problems.