To add a Lead Generation widget from your Advisor account to Squarespace, follow the steps below. Note that you must have a Squarespace Business plan to do this -- Squarespace requires a Business plan to embed any iframe or Javascript.
1. Add a new section to a Squarespace page by clicking on the blue "plus" icon.
2. Add a blank section by clicking on "Add Blank +".
3. Add a content block by clicking on the black circle.
4. Select a Code Block.
5. Copy-paste the Lead Generation widget code from your Advisor account.