Hi.
With the introduction of these browsers, we can now read websites which use foreign Alphabets AND unicode encoding. But, how do we enter text in these websites?
In those not using Unicode, i just set the right fonts, (This is in IBrowse) switch between keymaps and i'm able to write in Greek, cyrillic or whatever. I'm using OWB in MorphOS and Netsurf in AmigaOS. 
Switching keymaps should be enough.
If you're using the OS4 version of NetSurf, copying and pasting Unicode characters from elsewhere within NetSurf works (make sure UTF-8 Clipboard is set). I've improved Unicode text display in v2.6, potential pitfalls await until then.
However, I suspect you are using the framebuffer/OS3 version which AFAIK does not have any clipboard support. Changing the keymap should still work though, but Artur/Bernd would be in a better position to help.