How to add an attribute to existing cube?

Hi all.I am relatively new to SSAS. This problem does not sound difficult, I tried to solve it but could not find a solution.I have an existing cube in multi-dimensional mode in version 2008. I added a column in underlying SQL Server table. Now I need to add it to a cube. In a Data Source View I see this field. But I tried to edit cube, dimension, but could not find an option to add an attribute. How I can add it? Thanks