When you are editing email template in CodexFit, we have a rich text editor that you can use to broadly get your emails formatted how you'd like.
However, in our Automator and when you send a message to customers from the event check in screen, we only support either plain text or HTML formatted emails.
If you have a Shopify website, the best way to convert HTML is by using the Shopify editor.
You can go to Online Store -- Pages -- Draft your message/email in the content box. Then click the convert button (it looks like this: "<>") on the right side, and it will switch to HTML.
Next, you can copy the code across and paste it into Codex.
Alternatively, you can just Google and use any other HTML editor if you do not have access to Shopify. Any HTML editor allows you to make use of breaks between paragraphs, links, bold or underline formatting, as well as the rest of the standard HTML formatting available.