I normally use chrome and first time I logged in I couldnt find the button. If you are using chrome or mozilla and cant postor having bugs with the forum try using Internet Explorer.I found that the forum and website works better with IE. hope this post can help you solve your problem
Ut queant laxis resonare fibris, Mira gestorum famuli tuorum, Solve polluti labii reatum, Sancte Iohannes.
So that your servants may, with loosened voices, resound the wonders of your deeds, clean the guilt from our stained lips, O Saint John.