At the moment, the ability to log in with multiple accounts is not implemented. But there are also browsers that support Flash and allow you to enter the game.
For example, the Avant browser http://www.avantbrowser.com/download.aspx?uil=en
Download exactly the file shown in the screenshot https://prnt.sc/wn4kt7
Further – not the standard installation, but the second option. Select only the shortcut to the desktop.