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I logged in. What should I do now?

If you deposited some btc then click on the widgets button to display positions under the charts.
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So it displays open positions under chart so you can manage them.

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With the widgets you can add open orders and positions view to manage them.

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You just click buy to buy, and right click position to manage profit targets.Clicking sell shorts the pair, so use profit targets or x to close out if position.
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You can also click the little x at far right to flatten out a position at any time.

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Be very careful and start small to practice. Just buy dips and sell rips! Watch the videos and read documentation if you need help!