This can be easily done via your profile. To create an item just go to your shop and select the relevant template. Once the information has been entered (e.g. description, price, image) and reviewed, it will be added to your shop and into the main feed. Items can be updated at any time by selecting the edit shop item option.
You can select any of your public videos to use for promoting your shop item in the video edit screen for the video of your choosing.
