App Crowdfunder by Ethercycle: How to install manually

we tried to install the App " Crowdfunder by Ethercycle". Because the autmatic installation failed, we tried to do it manually. Does anybody know, where to place the code as the wizzard says:
manually install {% render ‘crowdfunder’, product: product %} at product-template.liquid right before the “Add to chart” form.

Where to place this snippet in Label-Theme? Thank you in advance.