Urgent need limesurvey & yii expert

I need to develop few websites. First one is in an open source php script. It's lime survey. But, you have to prove that, you are able to work on complex code. Limesurvey is built on yii framework and we use yii and codeigniter framework for our projects. You have to work with our employees or individually. First install a fresh copy limesurvey. Create survey. Under a survey, create participants. First task to prove yourself is bellow: in survey participants page, which user completed the survey, their name and email should not be displayed. In place of their their name and email 'xxx' can be printed. You will be only considerable if you tell us which files you need to edit to do it and what changes do we need to make, only then we will hire you. For this time/task, you will be paid, though it's a test of your skill. In any difficulties, contact, [Removed by admin]