After you have received your Brand Code from the Auto Care Association (http://autocarevip.com), you need to add it to myFitment.

Click on Products --> Manage Brands in myFitment:

Then click the New button:

Enter your Brand Label that you created from the Auto Care Association. Put the Brand Label in Brand Name. Then enter the 4-character code your received from the Auto Care Association in the Brand Code column. eBay VIP customers may wish to enter information about their store in the About the Brand column. Otherwise you can leave this information blank.

Now you will be able to check the box next to this brand code when you create or edit products:
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Any products that are created through an Upload file will automatically create and assign brands appropriately.