Change or Replace Variable!

[Super Jinni]

Hi,
I'm doing my first vbulletin product. and everything seems to be OK as I'm trying to figure out how is everything is working with vbulletin.

I came across this issue:
(my English is not that good and I'm afraid I won't be able to perfectly explain my issue, so please bear with me )

- I added templates and phrases and plugins.
- I added new setting group for my product.
- Chose the varname and title and other required things as well.
- Then added settings for my products and set if () in it's plugin and everything seems to be fine till now.
- then I added other setting with a blank field under the (Option Code) and chose it's varname which is rtrf_xxx_yyy.

Now, this varname should be an element of an array. and it should be $vbulletin->options['rtrf_xxx_yyy'] when called, right?

I just want to replace or change this variable (array element) and move it's value to a new variable so that I can use the new variable within the templates of my product instead of using $vbulletin->options['rtrf_xxx_yyy'], but I didn't know how to do that!

I've tried this in the plugin:

PHP Code:

$test =  $vbulletin->options['rtrf_xxx_yyy']; 


and then used the variable $test in the template but nothing showed up or happened.

But it works fine if I use {$vbulletin->options['rtrf_xxx_yyy']} within the template.

So my question is:
- How to replace $vbulletin->options['rtrf_xxx_yyy'] with a variable like $test and be able to use $test in the template that I need and make it shows up where I want in the forum?
- Does it matter where the hook is for variable replacement or variable changing?

Hope I did well explaining my issue, and hope I can get a fast reply ASAP.

thanks