Video instructions: https://somup.com/c0lu24kbJ1
Go to Products / Edit Product / Personalisations
Name: Enter the name of the option available to the customer
Personalisation Type: Change to checkbox.
Additional Cost: Enter the additional cost of choosing this option.
Required field: Prevents product from being added to the cart if an option is not selected. In the case of checkboxes, these are optional so do not enable as a required field.
Add: Click to add this option to your product.
You would like the customer to agree that this product takes longer than normal to deliver e.g. 3 week processing time. This is a required field and the customer can not proceed with the order without agreeing.