I have samsung galaxy ace - and on all browesrs the AB submit button is greyed out-so i cant post using my phone.Is this a problem particular to this phone ?
The 'Submit' button is meant to remained grey until you enter text into the reply box. If you enter text by simply copying-&-pasting content it will probably stay grey until you edit that content in some way. If it still remains grey, try clicking in the 'Enter YouTube Link Here' box. (I've absolutely no idea why that works but I've seen it suggested by the Ed here in the past!)