Using Icons is a great way to add design elements or create unique navigation or social icon buttons within your site.

To add an icon, select the canvas you wish to place the icon on. Then click on the Element Icon in the Bottom Toolbar and choose the Icon option in the menu that appears.
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Once you select the icon option it will add a default smiley face icon to your page that you can size and place where you would like. You can then use the Icon Settings tab & the Icon Chooser tab in the Properties Panel to the right to make changes to your icon.

In the Icon Settings tab, you can choose instead to add a custom icon to your site, or simply change the color of your icon.

In the Icon Chooser tab you can select an icon from the list of free Showit icons.

Once you have the icon that you want, you may want to make a duplicate in order to have a matching arrow or multiple similar icons. Check out this article here for more information.