How to insert code in the head-part of one single page?

edited January 2017 in Other
Hi,

I'm sorry, if this question is not clear or poor worded - but I'm not a webdesign pro, so please have patience with me... :-)

I want to offer a new service from an external provider on my site. It's a financing offer and I want to include their calculator, so that my clients can calculate their repayments and taxes. 
Now they sent me a javascript and they wrote, that I have to insert this in the <head>-area of the regarding page.

But as I built my pages with muffin builder, I don't understand, where I have to insert this code exactly?

Can anybody help me along here?

Thanks in advance and kind regards from Germany
Katharina

P.S.: if needed, my website is here: http://www.katharinahille.de

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