(Hope it’s not too late to answer in this thread, I am new to the forums and MODx in general so I hope you forgive me if there is a rule not to bring up threads older than given period of time)
You insert the line breaks in the chunk containing the template for your form. For example, when you have the following code:
<label for="name">Yuor name here</label>
<input maxlength="60" name="name" type="text" />
<label for="email">Your email</label>
<input maxlength="40" name="email" size="40" type="text" />
You just put a new paragraph or line break tag before each <label> like this:
<label for="name">Yuor name here</label>
<input maxlength="60" name="name" type="text" />
<br />
<label for="email">Your email</label>
<input maxlength="40" name="email" size="40" type="text" />