Labster requires cookies to function properly, so you need to make sure cookies are enabled in your browser. For instance, in some cases, you might be redirected to the login page while accessing the simulation through your School Portal/LMS (Canvas, Blackboard, Moodle..).
Here is how to fix it.
Instructions for Google Chrome:
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Open Google Chrome on your computer.
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Click on the three dots located in the top-right corner of the browser window. This will open a drop-down menu.
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From the menu, select 'Settings' This will open the Chrome settings page in a new tab.
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Click on the 'Privacy and security' section in the left pane.
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Find and click on 'Cookies and other site data' This will open the cookie settings page.
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Select the "Allow all cookies" option from the menu and reload your browser.

Instructions for Mozilla Firefox:
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Open Mozilla Firefox on your computer.
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Click on the three horizontal lines located in the top-right corner of the browser window. This will open a menu.
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From the menu, click on the 'Settings' tab and select the 'Privacy & Security' section in the left pane to access the privacy settings.
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Select the 'Custom' profile and untick the 'Cookies' option
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Click on the 'Reload All Tabs' option.

Please check out the Basic Troubleshooting article if you are having technical issues:
Please do not hesitate to reach out to our support team if you have any questions or are in need of assistance.