Apply for a HangATag account. It's free!
Once accepted you will receive a welcoming email, containing your password.
You can login to HangATag using that password. You can change the password in "Account" to something more memorable to you.
Go to "Manage Shop Subscriptions" and apply to the shops you want to promote (most of the shops will auto approve your application).
Go "back" to the main dashboard and click "create new product list"You can now create your product lists by dragging and dropping products from the shops you are approved.