Help..I can't post my fittness activity to FB any more..and I felt encouraged when I did..How do I

In the past..for months ..I have been posting my fitness workouts on FB. Now for some reason there is no button to click to be able to do that..The option is there on my trackers..but when I click it ..nothing other than it redirects me to my fitness pg. Its like a catch 22..Can someone help me..as I really enjoy seeing and sharing what I have done..it encourages me and hopefully encourages my FB friends..Thanks