How can i change my writing language . i changed it into Malayalam once then now i can't change it to English

in my yahoo messenger i cannot see that changing language. why? pls i want an immediate answer.How can i change my writing language . i changed it into Malayalam once then now i can't change it to English
Either press Alt+Shift to toggle between languages, or make sure the language bar is visible on the taskbar (bottom of the screen). To do this, right-click the taskbar, click on ';Toolbars'; and select ';Language bar';. You can then change your language from there.