If I already have lyft on my phone how can I do the Lyft Line?

Assuming you area already a Lyft Line? It should be automatic

If you are already a Lyft driver accepting rides for (regular Lyft) and Lyft Plus, you automatically qualify for driving a Lyft Line.  If you do not see the option inside your Lyft app, it may be because Lyft Line is not offered in your coverage area.  Please check with Lyft to see its availability.

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Uber Driver, CEO of TaxiFareFinder and Unleashed, LLC