This article can assist you in purchasing/upgrading your subscription on the mobile app.
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​Note: Lifetime subscriptions are only available for purchase through the web app. For assistance on purchasing a lifetime subscription, please refer to this article.
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​Step 1: Tap the three bars in the top left corner:

Step 2: Tap on Account:

Step 3: Tap on Upgrade and choose your desired plan:

If you have questions please contact us.