Am I allowed to promote a gambling website?

Only in case a legal gambling website is concerned. As from 2011, legal websites are licensed by the Gaming Commission. The list with legal gambling websites is available on this website.

Am I allowed to promote a gambling website that hasn't got a licence of the Gamng Commission?

A gambling website is a virtual gaming establishment. It is only allowed to promote licensed gaming establishments. It is not allowed to promote a website (.net or .free) through which games are being played that do not use money as the stake and thus are allowed, but that – for example – through their choice of name are clearly connected to a paying website (.com) without a licence.