I can open websites eg ibps.in but I cant fill the form over there that my device not support to this what should I do

ive mosilla firefox on my samsung android tab 2 here mobile internate data I use to open a tab web sites , and others but problem is that I want to fill exam form online web site is opening but only form is not opening message apears that ur device not support what shoud I do to ooen a form and fill it an ordinary mobile can open such a exam forms why my device doesnt support plz help me