I investigated my system and encountered differential equation such as

$y''(x) = e^{y(x)}-e^{-2y(x)}-e^{y(x)-y(x+d)}$,

where $d$ is a constant. The boundary condition is

$\psi'(0) = 30$

$\psi'(\infty)=0$.

I want to implement this in mathematica using NDsolve. Can anyone guide me ? I am really new to mathematica...