Hello, Melodeon, welcome to one of our FAQs, what we really need to compile a list of... click on "Forum Search" and put HTML in the subject box. That'll find you a thread that answers this and other questions like it.
In quick general, you have to learn some HTML code. You put the code between angle brackets and you get paragraphs, end lines, italic, bold, big words, flashing words, and blue clicky things, among others.
Blessings,
Barbara