I have changed my forum slug from 'community' to 'life-purpose-forum' and now the forum is accessible with both links.
Also, I've changed the admin's display name, but the old name still shows.
How do I fix the above issues?
There are two places for the slug. In wpForo AND mainly in the PAGE with the wpForo shortcode.
and EDIT the page, edit the SLUG in there. Save and you are done.