Integral subscripts - how to ?

[Aleksandr Konstantinov]

Hello, All.

  My knoweldge of latex is poor. So I'm sorry if this question looks
stupid.
When in LyX I put subscripts and superscripts after sign of summation ,
in final outpup I get then below and above that sign (for display
equation, of course).
But when I use subscript/superscript after integral sign - they are
lowered/rised and put
to the right of integral.
 How can I make them appear below/above the sign ? 
 How can I make my own sign with behavior like summ sign ?

Thanks in advance.

A.K.