Its ok I got it. Bit unintutive, but for others looking for this too,
Open Vsphere Client,
You be in the Home screen, if not, click Home in the address bar.
Double click the inventory window,
Highlight the root of the tree on the left pane, then in the right pane, you will have alist of tabs on the right (I presumed these were relating to the VMs directly)
Click on the Configuration tab
Under the Software list on the left hand side of this pane, the first option should be "Licensed Features"
There is an edit link on the top right hand side of this pane. Use the Enter key button on the bottom.