JetBrains requires a valid license to evaluate or use a JetBrains IDE. When running a JetBrains IDE in a browser, you need to perform the following steps.
Launch the JetBrains IDE in the browser from the workspaces page by clicking the JetBrains IDE icon. This example uses the JetBrains PhpStorm IDE.
Click the Log In to JetBrains Account button. You need a valid JetBrains account to proceed for both a trial and a paid license.
Because you already are in a browser, a new browser window cannot open. Click the Troubles link to proceed.
Click the copy link, open a new browser window, and paste the copied link to go to the JetBrains website to log in.
At the JetBrains website, log in with your valid JetBrains account to get the IDE authentication token.
Click the Copy token link to copy the IDE authentication token to your clipboard.
Paste the IDE authentication token back into your already opened JetBrains IDE window. Type Command + v (macOS) or Control + v (Linux/Windows) for the paste operation to work correctly.
You can now use the JetBrains IDE in a browser.