under the annual benefit elections there is a link with info about the legal plan, but it pretty much says this

"call 1 800 GET-MET 8 (1-800-438-6388) or click here to visit call 1 800 GET-MET 8 (1-800-438-6388) or click here to visit https://mybenefits.metlife.com/getGroupByIdForHP.htm?group=333392.

You have to enroll outside of the regular fedex.ehr website.