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Oh, sorry, I don't think cbb 2.3 uses frameworks.
I guess I don't know where you would add it. if you have a textsanitizer file somewhere, you might be able to find the xoopscodeDecode function and add the lines still.
If you are just starting your site, you will probably be happier using XOOPS 2.0.x rather than 2.2 which you have now. The 2.0 version supports more modules and is generally going to be what you want.
Then, you should get cbb 3.08 from dev.xoops.org to replace the older version you have now.
Those two things should help you get the best system.
If you did that:
You should have a directory xoops/frameworks/textsanitizer
There is a file module.textsanitizer.php
In that file there is the lines "function xoopscodeDecode"
right under those lines, which I listed in full above, you can add the top code segment that I posted.