If you have previously recommended this thread, you should see a tick / check mark on the recommend button. Click the tick to undo the recommendation (the tick may appear to change to a cross as you do this.) If you added a comment with your recommendation, you will need to delete that from your facebook wall separately.
You can list them in the directory but not as an event [unless it's a one off] or advertise them in talk. If you go to your Local pages you can list them in the directory from there, you can list under more than one service if it's relevant and area's, if relevant.
So if your pregnancy classes are run close to Bath and Bristol, you could legitimately list in both 'Local' pages [example only].
I hope that makes sense. When you received an e-mail it should have explained or linked to the appropriate area.
I had an email saying a thread had been reported and pulled regarding new pregnancy classes starting in the area. Mumsnet says they can be put on local site which is where they were. Please make it clear what and where I can put things as I am getting rarther cross.