(Tutorial by K-Meleon Community)
1. Download dictionaries that you like from the Mozilla web pages:
Right click and Save target as zip file.
Unzip file in a temporary folder and move the files "en-US.aff" and "en-US.dic" to a K-Meleon subfolder named "dictionaries". If you are using a different language download the one you want to use and put it in the same "dictionaries" folder.
2. Download the spelltest kplugin from K-Meleon Extensions Central:
Unzip the file in a temporary folder and then move the folders into K-Meleon installation folder.
3. To enable the SpellChecker in your language go to Preferences (F2) -> Page Display -> Languages