That depends on what kind of custom content you want to add. To add a question that is specific to you, you can just ask a question in the search bar. If it hasn't been asked before, your "custom" question will be added to the database. You can also add answers to questions that other people have asked, and that is a custom answer by you. :)
You can also edit your profile and add custom things there.
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Your WikiAnswers profile will automatically stretch to fit the amount of content you wish to add.
You can find custom content on various third-party websites, or by downloading pre-made Sims with custom content from the Sims 3 Exchange.
No, WikiAnswers will not pay users to add links.
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Content is occasionally removed from WikiAnswers when it is deemed inappropriate or illegal.
It is illegal to put custom content onto the Xbox 360. Therefore this is your problem and you should solve it yourself.
By having TSR workshop for custom content or if you want to get custom content go to Modthesims3.com or TheSimsresource.com
If you know how to make custom content then you can. Mod the Sims has a "how to" tutorial on custom content.
At the moment you cannot add any spellings to the WikiAnswers spell-check dictionary.
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Real Sims 2 custom content must be installed. as an add in to the game. when you download the file the icon should be a dark blue circle with a light blue person inside it. You must execute this file just like an installation file to add the content into the game.