> If you are using the CORS allowed origin restriction (`BK_DOMAIN_NAME`), make sure it is matching your application URL (see [common errors](common-errors.md)).
Use the menu bar to navigate to the **Add** page, make sure the socket is in a **connected** state.
![](images/first-steps-04.png)
Input a set number in the **Set number** field and press the **Add** button.
You can either use the set number (e.g `608`) and it will automitcally assume that you want version `1` (e.g `608-1`),
or you can use the complete number with the version (e.g `608-2`)
It will load information about the set you are about to add, but not add it yet.
![](images/first-steps-05.png)
Use the **Confirm add** button to add the set, or the **Dismiss** button if it is not the one you wanted.