how do i share my internet connection wirelessly while using it on the pro as well

how do i share my internet connection wirelessly while using it on the pro as well

how do I share my internet connection wirelessly with other gadgets while using it simultaneously on my mac book pro.I am using a Idea netsetter 3 g dongle for broadband internet,however when I go to the settings to share it with other devices the mac book is the only one left out of the connection