How can I use a guide bushing on this base plate?

You will need to install the 1-3/16" center hole sub base, sold separately (49-54-1040). Link below to the sub base and template guide set.https://www.toolnut.com/milwaukee-49-54-1040-1-3-16-center-hole-router-sub-base-for-template-guide-bushings.htmlhttps://www.toolnut.com/milwaukee-49-54-0700-template-guide-kit-9-piece.html