How to name surface of mesh in Gmsh for Fluent?
 

I am using Gmsh to generate mesh, and Fluent to solve fluid simulation problems. Though Gmsh export mesh files which cannot be identified by Fluent, I used OpenFoam to transform it.
However, I still have a problem duing the process. As I have to define the boundary conditions in Fluent, I need to name specific surface in Gmsh. How can I do this?