This tutorial shows basic fin techniques plus utilising multiple layers to create any fin setup that your heart desires. Unless, of course, if you want to add them to the deck of the board...
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1. Click on the add layer button.
2. In the properties panel, choose the brand of fins, the setup and the colour.

Fins will be placed in a standard position for the board size and width.
The properties panel allows for finer control of fin positioning.

To make fin setups that are not included in the stock fin configurations, use separate fin layers to achieve your desired results.