Register at OSM
Create OSM account if you dont have.
Login to OSM
Click on Edit, Select "Edit with id( in Browser)".
Enable Kannada in Chrome input tools. You have to install "Google Input Tools" chrome addon for this. If you know any other way to enter/type Kannada, then that is fine too.
Select an Item to Translate
Select a poi/area/road to translate.
Click on the plus sign next to the name to get options to transalate.
Choose or Type Kannada in the language drop down.
Now enter the translated name.
Save after every logical step.
Enter meaningful comments in English.
You are Awesome
Done. You are awesome. Now go translate more.