If you are currently a trial member or want to upgrade your plan to a higher tier you can do so from the Settings menu.

First, click on the arrow in the upper right hand corner of the app. Then click Settings > Plan > Upgrade. You will then be presented with option for your new plan.

From the "Plan" page in settings you can also redeem any coupons you have received.

If you have purchased a lifetime storage deal with Rethink, any monthly subscription you purchase in addition will stack on-top of your original lifetime deal. 

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