How to add a "read more" arrow?

Ruby gives you the option of manually adding the read more arrow-button to each post. It's a great option when you want to show only the few lines of the content.

It will look like on the screen below:

When creating or editing a post, select the button in your post tools called "Insert Read More Tag".
A horizontal dash line will appear in your post (while using Visual editor) or <!--more--> tag will appear (while using Text editor).

Look at the screen below:

And that's it!