Editing Terrain Textures With Graph Editor Help

Hello, I was wondering if someone could help me with the graph editor. I'm trying to texture my large terrain using rgb to display each terrain texture. I've tried what i could but i can't seen to get textures to display properly. it looks like the alignment is off and the textures are too stretched out. i would like to be able to control how the texture is tiled and make sure the textures are aligned properly or scaled properly. I am using LWRP (Lightwave Render Protocol 2018.3)