In the free SiteBuilder package which comes with every SiteGround account, HTML code can be added through Edit Text > Switch to HTML source (A button with "<A>" mark on it).

Please note that the built-in HTML editor is used primarily for fixing coding issues. Inserting HTML code might not function properly since some of the tags might be stripped. In this case we recommend you to consider upgrading to SiteBuilder Pro package.

You can order a SiteBuilder upgrade from your Customer Area > Order Extras > SiteBuilder upgrade.

You can easily add HTML code in SiteBuilder Pro by adding a widget containing the code through Edit Layout > New > Widget > Java Script or HTML.