Currently, it is not possible to use the same username to log in to the Interactive Brokers website and use Trader Workstation at the same time. You need to create an additional username for your account. To create additional username for your account, follow the instruction at https://www.interactivebrokers.com/en/software/am3/am.htm#am/settings/addingusernamestoauser.htm.
About the author
Xuan Ngo is the founder of OpenWritings.net. He currently lives in Montreal, Canada. He loves to write about programming and open source subjects.