Like most designers, I strongly recommend against using justified text on a web page because the web isn't like print media.
When you justify text on a web page it reduces readability and makes it extremely difficult for dyslexic readers (and many others) to read and understand the content. Justification causes gaps between the words, and sometimes these gaps line up and form what are called "rivers" within the text block.
I recommend reading this post to understand why justification doesn't work well on web pages. If, after reading it, you still want to go ahead, please provide forum users with a link to the page on your site and explain which text you'd like to change.
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