To manually define the position of the size chart link/button insert this code into the product-view.html file of your Stencil theme:

<div class='prikid-size-chart-button-placeholder'></div>

The size chart link/button will be showing at the position where the code snippet placed

If you check the product page you can see that the position of the Size chart link has changed (moved down a little)

If you need help placing the link/button in a specific location on the page, feel free to contact us