I'm not sure to understand your question , but if you didn't change your nickname since a while you can do it. If you changed it recently , you need to wait 3 months i think
I see what they did now. Good, Back some time ago you had to buy name change tickets using a site currency that you built up by being active on the forums/ect. They shifted from that.
the rupee system has been retired some time back, now title changes and the like are free, while namechanges can happen once every while, aka like 90 days after the last namechange for regular members I believe.