First of all, go to https://app.marpledata.com/ to get started.
You should see the following screen (if you are not logged in yet):

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In order to use Marple, you need to create an account. No worries, this is completely free of charge!
If you are invited to a workspace, make sure to use the correct email address.
If you already have an account, you can just fill in your credentials and continue.

If you have created a new account, you will be prompted to create a workspace:

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Creating a workspace will allow you to give your workspace a name and invite other team members. You can skip this step and set up the workspace later.

In order to get you kickstarted, you can initialize Marple with some example data!
Again, feel free to skip this if you know what you are doing.
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If you managed to do these steps, you should end up in the following view:

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You are all set-up and ready to go!

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Make sure to check out the 'First Steps' section to learn how to make your first visualization.