Unfortunately there is no button to simply justify text inside RapidWeaver’s WYSIWYG editing toolbar. HTML & CSS can be used to achieved this effect with a symbol copy and paste of the following code:

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<p style="text-align: justify;">Enter Your Text</p>

Note that it is always best practice to highlight sections where you add HTML and hit CMD + . which simply protects the syntax from RapidWeaver’s built in auto-correct feature.