Soniya,
Be careful while posting links in the public forum. The link given in your post is not from any of the islamic scholars and therefore is not authentic at all.

I agree with your next post saying that the meaning of 'nikah' is not marriage. Yes, literal meaning of Nikah is not marriage. Nikah, as posted by other QLers means the marriage agreement or marriage contract. There are some conditions and prerquisites for it and the contract is normally verbal.However, due to need or necessity, it may be done through writing or signing.

The explanation given in the first link seems blaspemous to me.