Tokens are to be embedded within the job step command text. They are replaced at runtime with the value pointed to by the token.
From Example A in the article I linked to:
PRINT N'Current database name is $(A-DBN)' ;
Put the above text into a T-SQL Job Step and run the job. Look at the job history. Then open the job and change text to:
USE msdb;
PRINT N'Current database name is $(A-DBN)' ;
Now run the job again and check the job history.
There are no special teachers of virtue, because virtue is taught by the whole community.
--Plato