Add the texture to your material using UV mapping.

Then here is a checklist I use for blender to make the transparency work in the viewport, GE and render:

GLSL material
Materials: Render pipeline: ZTransp
Materials: Alpha = 0
Materials: Texture: UV and Flat
Materials: Texture: Map To: Col and Alpha
Texture: Image: Premul
Texture: Map Image: Use Alpha
Mesh Text Face: Use Alpha

CTRLKEY + EKEY per fare il make seam

Edit Mode –> Vertex Mode –> Select –> Non-Manifold

Python Script –> Mesh –> Clean Mesh

1Key –> array modifier –> relative offset x 2

add empty

array modifier –> object offset : Empty

select Empty : RKey + ZKey