If you want to add CSRF to manually created form in wordPress? If you are using WordPress 2.0.4 or above you can use wp_nonce_field and wp_verify_nonce field to verify. The WordPress documentation has some examples (which I posted below).
In your form:
<!-- some inputs here ... -->
<?php wp_nonce_field('name_of_my_action','name_of_nonce_field'); ?>
In your processing action:
if ( empty($_POST) || !wp_verify_nonce($_POST['name_of_nonce_field'],'name_of_my_action') )
print 'Sorry, your nonce did not verify.';
// process form data
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