This is a sample function showing how to get a link toward the "Manage your subscriptions page" in Wysija http://wordpress.org/plugins/wysija-newsletters/description/

wysija_get_subscription_link

/**
 * This is a sample function showing how to get a link toward the "Manage your subscriptions page" in Wysija (http://wordpress.org/plugins/wysija-newsletters/description/)
 * You'll need to call that function at a moment where Wysija's classes are already loaded otherwise it won't work
 * @return subscription link for the current logged in WordPress' user
 */
function wysija_get_subscriptions_edit_link(){
    // wysija classes ar enot loaded so we can't use that function
    if (!class_exists('WYSIJA')){
        return;
    }

    // let's get the current WordPress user ID
    $model_user = WYSIJA::get('user','model',false,'wysija-newsletters',false);
    $model_user ->getFormat=OBJECT;
    $wpuser_id = WYSIJA::wp_get_userdata('ID');

    // there is no logged in WordPress user
    if (empty($wpuser_id)){
        return;
    }

    // let's try to get the corresponding Wysija's subscriber to that WordPress' user ID
    $user_object = $model_user ->getOne(false,array('wpuser_id'=>$wpuser_id));
    if (empty($user_object)){
        return;
    }

    // we return the subscription link for that user
    return $model_user ->getConfirmLink($user_object,'subscriptions',false,true);
}