You can access the "Paper Trader" broker profile in Multi-Charts which will allow you access to Simulation mode using your LIVE credentials. To access first make sure you are properly connected to the "Paper trader" broker profile. You can go to File-Broker profile-manage broker profile. Select the "Paper Trader" broker profile and make sure it is "Connected."
Once connected you can simply toggle to the "paper trader" profile on your DOM or Chart Trader to switch to the Simulation mode.