# I am logged in, but cannot start the modules
##### 1. Book module
As soon as you are logged in, you must first assign the module in the desired language using the **‘Book’** button. | [](https://docs.swisslearninghub.help/uploads/images/gallery/2025-04/zs89gF0JPjBI9UeU-image.png) |
***Attention:** If you do not see a ‘Book’ button, it is possible that you are using an outdated operating system version or an outdated browser. The learning platform is optimised for the **latest versions of Windows and Mac**. It is therefore possible that the learning platform does not function correctly or is not displayed correctly with outdated versions.*
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##### 2. Start module
As soon as you have clicked on ‘Book’, you can then start the module by clicking the **‘Play’** button. | [](https://docs.swisslearninghub.help/uploads/images/gallery/2025-04/rfsNu77gRTavKTk4-image.png) |
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