How do you do rhyme scheme

In order to do a rhyme scheme look at the last few words of each line and name each new one with a letter a, b, c, d

Each time that a similar or rhyming sound is mentioned in different lines repeat the letter

Example: The rhyme scheme is aba

I wish there was a way to go back (a)

To take back everything I said (b)

I wish would come back (a)