A "content link" will establish a link from one content block on your page to another content type on your page, or from one page to a specific piece of content on another page on your site. In the latter usage, instead of linking to another page, you are linking to a specific block of content on another page. 

For example, if you want to link to a Google map on one of your pages, you would create a content link to that Google map.

To create a link to content on a page:

1. Use your mouse to highlight the line of text you want to hyperlink
2. Click the link icon circled below, and choose "Insert content link."

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You will be taken to a map of your site structure:

Locate the page that contains the content type you want to link to, then click directly on this page to open the folder.

You will be taken to a list of all content in that folder/page:

Click directly on whatever piece of content you want to link to. T4 will establish this link. 

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Don't forget to save, approve, and publish your changes so they appear on your website.