Go into your AppScenic Account, click on My Products then on View My Products.
You can go on in two ways:
1. Now find the product you want to update the tags for and click on it to land on its page.
On the top right corner of your product page, just under Product Status, you have Product Groups.
Under Product Groups, you will find Tags.
Now, just click on Tags and make your changes.
Then click Save and you are all set.
2. From the products list, find the product you want to update the tags for and select it.
On top of your product list, you can find the tab Tags.
Click on it and choose the Tag you want to add or remove your product from.
After you made your change, click on Save.
And you have just updated the tags for a product. :)