i'm new on Blender and i'm trying to learn much things everyday through tutorials. Now i'm trying to make a Spyro fan game with Unity using Blender to create textured models but i'm having some problems. To make a Spyro fan game i have to use the Texture Atlas method (used to make textures ps1 style)

I followed this tutorial: https://www.youtube.com/watch?v=Z1MouKWH6IM&t=23s

Now i'm stuck here

I really don't know how to export the texture and use it then on Unity On the right you can see that tried to mess with the Texture tab not having success