Add multiple fields in Model builder

Hi
I hope someone can help me with this issue. As usual I thought it would be simple, but I can't figure it out...

I want to add many fields to a feature class in a geodatabase. I need to to this in model builder, since it is a part of a bigger model.

I have been trying to use different iterators and the tool "add field" togehter with a separate table with the field names. But I can't get it to work ( I am a beginner with model builer).

Does anyone have a solution for this? I would be greatful! The faster the better!
Thanks!

Karin Henrikson

ps. I use ArcGIS 10.2