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Recently I've been really trying to get more involved with the Google+ community because of the partnership with YouTube. By doing that I wanted to make sure that when people visit my website, they can easily share to Google+ by just clicking a button. I had tried to setup the process before, but ended up failing and just creating a link for people to share my homepage instead of the article itself. I thought it might be helpful to create a simple and quick tutorial for other Squarespace users to setup this button on their website.
The first thing you need to do is get the code for the Google+ button you want by visiting this link. In here you can select the size, style, and look of the button you want to use. Go wild.

Once you've selected the width, and style of your button go ahead and click the 'Advanced Options' dropdown.
Here we are going to adjust the button to ensure that the user visiting your website is sharing that specific blog post, and not just your whole website. To do this you need to type the following into the 'URL to +1' text box: %PERMALINK& - what this will do is recognize the URL link of your post, and share that link when the user clicks the button.
Congratulations, you now have a fully functioning Google+ button - but how do you get it on your Squarespace blog? Keep the Google+ code page open, you'll need that code in a minute. Open up your blog and make sure you are in 'Structure' mode.

Once you've done that, navigate to your blog and click 'configure this page'.

This will activate your blogs control panel which will allow you to embed the button code into all of your posts. Once your control panel has popped up, scroll down to 'Post Display Configuration'.

Click on an HTML Snippet that isn't being used, for instance I'll use 'HTML Snippet 1'. Remember when I said you'd need that Google code soon? Bring up that page now and find the text that I've highlighted below.

Take that one line of code, and paste it into the HTML Snippet box like pictured below.

Once you've got that line of code installed click 'Hide & Save' and you're officially done step 2, but don't close that Google code page yet. Now to complete the process, make sure you are still in 'Structure' mode and navigate to your website footer.

Open up the code for the website footer, and then grab the bottom code from the Google page from before. I've higlighted it below for your reference.

Paste that code somewhere in your footer, and BOOM! Congratulations, you have officially put a Google+ share button in all of your posts on your Squarespace blog.