We've had the ability to add and edit colorways, but no way to add an entirely new item. I've gone and added that feature now. Same user levels apply. All members can add, if you want to edit and don't see the link, shoot me a PM and I will give you the ability.
On the main database page, there will be a link at the bottom to add an item. This will allow you to enter most anything including choosing a family. If you had already navigated to a specific family, the Add link will be there, but it will prefill the family field for you. Some like Stretchline or Square O, will go into the Family (Alt) field, since items can have more than one alternate group. Things that aren't glasses won't have this, so you won't need to worry about them.
On the colorway listing page, I've moved the Add Color link down a bit, and put a Change link in as well to edit the details. This will allow you to alter the detail entry, as well as assign a master image (assuming some have been added for the colorways).