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If you wish to hide/show sections of your document based on certain conditions then you can surround that text with consitional merge fields (IF, ELSEIF, ELSE)

Syntax

...

[[*IF {FirstName|pt=Client|rn=*} = "Steve" *]] Hello Steve [[*ENDIF*]] 

The * denotes that we're doing something special while the IF starts the conditional statement

[[*IF

The standard merge fields from your merge field list should be included in braces (otherwise known as "curly brackets")

{FirstName|pt=Client|rn=*}

Any static values should be included in quotes and there should be an operator in front of that static value

="Steve"]]

The text that you wish to display should follow the conditional start field 
Hello Steve 

Finally, you will need to include a conditional field stop

 [[*ENDIF*]] 

You can add any number of ELSEIF options for additional conditions and and ELSE section as a catch-all if all prior IF/ELSEIF conditional are false

Example