DCS WIFI

Have you downloaded the full wifi manual from the MTH web site?  I strongly recommend that you do so.  There you shall find:

For Routers with WPS (Wi-Fi Protected Setup)
1. Attach the antenna to the WIU.
2. Set the MTH/HOME selector switch to HOME.
3. Conned the WIU to your TIU with a USB cable (included*).
4. Apply track power through the TIU.
5. Plug the WIU into an AC wall outlet.
6. Wait 1 minute for the WIU to initialize. When ready, the PWR, WI-FI, and TIU LEDS
will be lit.
7. Press the WPS BUTTON on you’re your home Wi-Fi router and then press and release.
WPS BUTTON on your WIU. Note, some routers may require you to press and hold the
WPS BUTTON for several seconds. Check the manual for your specific router.
8. Wait until the white WPS LED on the WIU is on steadily. It will go off after a few
minutes.
9. If you haven’t already, go to the iOS App Store or Google Play Store and install the app
on your smart device. Search for MTH DCS to quickly find the app in either app store.
10. Open the app and tap RUN MY TRAINS.
11. Tap CHOOSE OR ADD AN ENGINE the tap ADD MTH ENGINE and follow the prompts.
12. Tap START UP and enjoy running your trains in Wi-Fi DCS!

If your home router doesn't have a WPS button, the language following the above in the manual covers it.

I haven't tried changing any engine names.  I still handle all of that stuff on a designated remote, from which I clone other remotes.  Then when I add a loco to the app, it comes in as I want it.  Be careful if you have different names or ID numbers on remotes and app device. 

I have no idea how you can tell from an app which version you have.

Once you purchase an app upgrade on one device, there's no charge for subsequent devices as long as they're all tech same "species", i.e., iOS or Android.

Barry, I have a windows based HTC phone.  Do you know when the MTH APP be available for it?

MTH has announced no plans to develop a version of the DCS App for Windows smartphones. I've not even heard any rumors in this regard.

Thanks, Barry.  Now, I'll buy an IPhone when the new ones come out in April.   The Samsung tablet works in the meantime.