Go to AdminCP => User Profile Fields => Add new User Profile field => Single Select Menu
Title: View Forum Effects
Description: Choose yes to view forum effects.
Options:
Yes
No
Set Default: Yes, but No First Blank Option
Editable By User: Yes
Display Page: Options: Other Options
Write down your field# . i.e field5
Change X to the Field id.
Just remember to wrap the code with the if tags provided.
Code:
<if condition="$bbuserinfo[fieldX] != 'No'">
Add The Code Here
</if>