If Condition on Profile Fields
 

I have the code here.

Code:
$post[field7]
Basically what it does if someone fills out profile field #7 their input is posted under their signature.

However, I want those who do NOT have anything filled out in their signature (hence profile field 7 is empty) to instead of show the text N/A like below. I think an else statement should be used but I don't exactly get what to input for the if condition.

Code:
N/A