Cant post any tweets, trends are not coming up and twitter buttons are not working


When ever I sign into twitter the back ground 'Username or Email keeps showing up and therefore my username over laps his instead of getting rid of it. Also when I do sign in and go to my home page I cannot tweet or type anything in the box and when there is writing in the box it is a light grey colour and still wont tweet. Finally when I sign in I cant use the buttons on twitter e.g. connect or discover. This has been happening for a few days and I don’t know what to do.