To enter paragraph separations please remember that the welcome message needs to be in HTML format. Wrap <p> and </p> tags around your paragraphs. See example below:
<p>Setting up your online account at Active Giving is the first step to supercharging your fundraising efforts. Based on our experience, we've learned it only takes a few simple steps to ensure a successful campaign.</p>
<p>Your personal webpage is your chance to customize your fundraising message to your family, friends, and other donors. Generally speaking, people contribute to your cause based on the personal message you convey.</p>
Tip: There are several other features that can be included in your message. Bullet points for lists and font styles such as italics and bold will help accentuate your text. To learn how to perform these tasks as well as many others, do a search for basic HTML code on your favorite search engine and enter the appropriate code in your message.