adjust or remove avatar

I have looked at similar questions and responses to this question but the answers are too short….

I would like to either adjust the avatar size (because my theme is making them to large) or remove them all together. I noticed some coding that could be used but you do not state where the code should be placed or what line it should be placed on. Please let me know exactly what .css file should be modified, what should be written to reduce or remove the avatar and on what line to place the code.

Also I am using the (Dream Way Theme) if this helps