That's because the default in-game key binding for your talent pane is N. You seem to not be understanding that you need to assign an Interact with Target key binding in World of Warcraft because this action is not bound to anything by default in the game itself. Here are the instructions you should have first followed direct from the Wiki page (this is also shown in the video you watched):
Here's an image if you still can't find it:Finding Interact with Target in the in-game Key Bindings window
- Enter the game
- Turn Key Maps off (Shift+Alt+M)
- Turn Repeater on (Shift+Alt+R)
- Open up the in-game menu with Video, Interface, Key Bindings and other options (Escape)
- Click on Key Bindings
- Locate the Interact with Target key binding, under Targeting
- Set the Interact with Target key binding to your desired key combination, such as 'G'
- Turn Repeater back off (Shift+Alt+R)
- Turn Key Maps back on (Shift+Alt+M)
Don't set it to "J" like it's shown in the image, set it to "G" which is what you are sending to the game clients.
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