Hi @sa02000,
FOREX.com lets you choose from multiple trading platforms including MT4. Make sure your demo account is set up for MT4 by requesting login details using this form: https://on.forex.com/MT4demo
The email you receive will include links to both the desktop (for PC users) and web (for Mac, Linux and public computer users) versions of our MT4 platform so you can connect to our servers.
If you ever have questions about FOREX.com, you are welcome to reach out to us in the Broker Support section of BabyPips: FOREX.com discussion