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First, login to Squarespace, go to the Navigation paneclick on the Pages tab, and click on the page you want to embed the scheduler on:
Find Find where you want to add the scheduler on your page and click the drop icon on the left to get your block selector:
Once you have the block selector pulled up, scroll down select the "EmbedCode" option:
In the embed box, click the cog icon:
This will bring up the Embed Code box where you can paste your scheduler into (if you need to know how to find your scheduler ember code, see the documentation here). Then press "SetApply".
If you need to center it on your page, here's a good line of code to add around it:
