For this guide, I'll be adding example.exe located in C:\Users\SomeApp\example.exe.

On the lower middle section of your screen where it says "Search", type "control panel" and navigate to your Control Panel.

The window that pops up is the Control Panel. Click "System and Security" at the top left-hand side of this window. In the next window, select System.

In the middle of the next screen, select Advanced system settings

On the panel that pops up, click "Environmental Variables..."

On the next panel, select Path and then Edit...

On the panel that pops up, select New. This is where we will put the path. In my case, I will type: C:\Users\SomeApp as shown below.

Select "Ok" on all three open panels and restart command prompt and you'll be good to go!