Kunena template does not afford using such params in back-end by default, but I'll tell you about the trick.
Open the following file: components/com_kunena/template/rnd_kascetic/template.xml
In the bottom you'll find two lines:
Just replace thse lines on:
<param name="avatarSizeXProfile" type="hidden" default="200" />
<param name="avatarSizeYProfile" type="hidden" default="200" />
<param name="avatarSizeXProfile" type="text" default="200" />
<param name="avatarSizeYProfile" type="text" default="200" />
Once you're done, two new params will be available in template back-end settings: profile avatar's width and height.
You must fill these values without px prefix, I mean if you need 300px just input 300 without px.
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I did try to apply this change. But still don't see two new parameters in the template back-end settings.
I assume it should be forum template (Kunena Forum: Template Manager -> Template: Rnd_korder -> Basic settings)? I also tried explicitly change avatar size in posts to 100px, but it has no effect.
I suspect I'm doing something wrong but cannot identify what exactly