Struggling To Embed My Ralawise Catalogue On My Website

Hey there guys,

This is my first post. Nice to meet you all:)

I'm a serious beginner when it comes to embedding and coding, so apologies for the lack of knowledge! I'm trying to get a live product catalogue on my website for a garment supplier I'm going to start using.. I also need to use the iframe resizer. My instructions are as follows:
1. Select the embedded theme from administration

Go to administration (manage.yourwebshop.com) and select 'Theme 3' from 'Design & Content – Templates'

2. Download the javascript file iFrameResizer.js

Download the javascript file iFrameResizer.js from here (right click and save as)

 3. Upload the iFrameResizer.js script to your website folder

 Add the file iFrameResizer.js that you downloaded in step 3 to your scripts folder (or any location you prefer to store your javascript files). 

4. Insert the script references to your webpage

 Add the below html to the scripts section of your web page. Now update the src attribute so that it points to the location where you have just placed the iFrameResizer.js file.

<script type="text/javascript" src="iFrameResizer.min.js"></script>
<script type="text/javascript">
window.onload = function() {
iFrameResize({
log                     : false,
enablePublicMethods     : true, 
enableInPageLinks       : true
});
};
</script>

5. Add the iFrame to your website

Add the below html to page where you want to display Your Web Shop. Update the src attribute to point to your own webshop url. 
 
<iframe src="http://*YOURSUBDOMAINGOESHERE*.yourwebshop.com" frameborder="0"  width="100%" height="1800px"scrolling="yes"></iframe>

I can't seem to figure out  3. Upload the iFrameResizer.js script to your website folder .. Where is this placed please?

Hoping someone can help please:)

Kind Regards

Pierre