Can somebody say how to go to challenges or give any link?

Answer 1

First of go to setting

then manage weapon

and switch on the languages for challenges.

In which you want to challenge other or want to be challenged.

Answer 2

select the play section in the bottom of your phone navigation and Click on the plus and select the user and the language whom you want to challenge

Answer 3

Now click on play
(at bottom strip)
Click on +
Choose a language.
Choose opponent.
Answer the questions.
Wait for result.