Google Tag Manager (GTM) is a quick and easy way to add the first step of the tracking code (the main JavaScript) to your website.  
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Please note for step 2 in your set up instructions (wrapping the phone numbers with your class name) you will need to do this directly in the CMS or FTP of the website, unfortunately this cannot be done via GTM.  
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In your tag manager account, select “Add New Tag” 

You then want to select to ‘choose a tag type’ and then from the drop down list select ‘Custom HTML’ 

Under Tag Configuration, Paste your Ruler Analytics JavaScript. You can find your unique script in your Ruler Analytics account here. 

Ensure you set the Tag Firing options to once per page. This will ensure Ruler captures data across your whole website.

Then under ‘Triggering’ select ‘All Pages’ from the available list.

Once you have saved the Tag, Push the changes live on to your site.