If you like to buy something and do not have an Icelandic Social Security number (Kennitala) here is what you do.
Step 1: When you start - you have to log in for the first time (this is the same for everyone and to ensure that the - you only have to do this once) - if you already have an account you should be able to login
Step 2: If you don't have an account - select New User
Step 3: If you don't have an Icelandic Social Security Number, then choose your country. In the example below we have a tourist from the United Kingdom who wants to buy a football camp. If you have an Icelandic Social Security Number (Kennitala) select Iceland and proceed with Electronic Authentication (Rafræn skilríki)
Step 4: You get a confirmation mail where you choose your password
Step 5: After that you have an account and can login as described in step 1