modulation - How can I generate offset QPSK symbols from QPSK symbols

I am trying to generate Offset-QPSK modulated symbols. But I am facing some difficulties. I know how to make QPSK symbols but I am unable to figure out at what stage I have to bring in changes to make it OFFSET QPSK.

The following are the steps I did:

1. Generated a stream of 1s and 0 s


2. I have paired at 2 consecutive bits and mapped it to one among the integers 0,1,2,3.


3. Now I map these integers to $(1+j), \ (-1+j), \ (-1-j), \ (1-j) $ following grey code based ordering.

I know that these are the steps for QPSK. But I am not sure If I need to generate OQPSK symbols at which step should I make changes and what are the changes?

Any help is appreciated.