Hello I’m new to the forums a swell as blender. I am using 2.8 and have a texture along with mesh of a crab I downloaded and cant figure out how too change the eyes. How would I do That? 
It automatically uses the first one.
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Without a file to look at it’s impossible to guess.
Look at this tutorial:
Here is one I helped out with a long time ago. I don’t have a PC/Blender so unable to do it myself, but it should be possible to change it so that you look up a single strip (iirc the linked one is a 2D array of images) of images and select image by animating a single value. You’d have to make a note on which number produce which face.