In the dimension browser, you can only browse the individual attributes of your dimension. If you want to see them side by side, you can create an attribute that combines both in the data source view, or you can put them together in the cube browser or in any other client tool.
You can rename the attribute in the dimension structure tab. Select the attribute and hit F2.
To add the dimension to your cube, open the cube editor and go to the Cube structure tab. In the left bottom you have to cube dimensions window. Right click on the cube and select Add Cube Dimension.