Use LoadTexture to load the texture. Look in the help file and you will see that there is a flag to specify that the image has an alpha map with it. Both TGA and PNG supprot alpha maps, though older versions of phootshop sometimes have problems exporting PNG properly.
Then create a sprite with createsprite() and change it's size and position with the appropriate sprite commands which will be right there alongside it in the help file.
Then use EntityTexture to apply the texture to the sprite entity.
Use EntityFX to set the sprite to full bright and no fog.
And finally, set EntityOrder ... to a positive value greater than 0 I believe, to make it draw in front of everything else in the scene.
Then create a sprite with createsprite() and change it's size and position with the appropriate sprite commands which will be right there alongside it in the help file.
Then use EntityTexture to apply the texture to the sprite entity.
Use EntityFX to set the sprite to full bright and no fog.
And finally, set EntityOrder ... to a positive value greater than 0 I believe, to make it draw in front of everything else in the scene.