You can link from one Article to another, or to external URLs, by creating links in your articles.
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To link text in your Article to an external URL, simply surround the linked text with brackets, and then include the URL within parenthesis, like this:

The result will be that viewers of your Article will now be able to click "Linked Text" to be sent to http://sixcycle.com. Note that all external links will open in new browser tabs/windows. 

To create a link in your Article to another Article, place your cursor where you would like the link to be created, then click "Links" on the right of the screen to open the Links Panel. Search for the Article you would like to link to by Article name, author name or Article contents. Select the Article from the list of matches, then click "Insert." Your link will be inserted into your Article contents like this:

The result will be that viewers of your Article will now be able to click the name of the Article to navigate to that Article. If you happen to know the Article Slug, you can type this link out by hand.