I'm guessing we are talking about two different issues now.
As for the voices, when you log in at TomTom's main site (in your case,
https://www.tomtom.com/en_us/navigation/, you eventually log in with the email and password that you have assigned to your device to make a voice purchase.
It sounds as though at one time you had an older "Nav2" device that worked through TomTom Home to buy maps, voices, etc. That's not how they're doing it these days.
As for planning, that's a different web site that TomTom also confusingly calls MyDrive (we asked them not to do that, but...) at
https://mydrive.tomtom.com/en_gb/
You can log in there - again, using the SAME email and password as for the device - and create a route that can be transferred to your device. If you have any custom POI (*.ov2) files, you can also drop them at this site for automatic transfer to your device.
Be aware that if you connect your device to your PC, if MyDrive is up and running, anything you are doing with the device is done across the USB cable when it comes to updates, etc. The MyDrive user interface isn't of any particular use, but the hardwired connection back to TomTom is supported by the MyDrive app. Depending upon your situation, that may be preferable to using WiFi to accomplish the same thing.