Question

Give the right use of word 'thou'.

Answer 1

The right use of 'thou' = YOU.......!

Answer 2

The word thou, used in place of "you," is not used much in modern language. In fact, with its Biblical feeling, it's most often used in religious contexts. Otherwise, it might be used as slang for thousand. Anyone familiar with the Bible knows the word thou means "you."
Well as you can see above it is not used currently
but if you want to use it
then do it in the place of you
your welcome
Hope I helped!