When you say you changed it in main.css I assume your mean in /orca/layout/base/css/main.css
If so be sure you are editing the right location in main.css
Then you should go to your main dolphin admin panel then to plugins orca forum/administration area. Then you have to recompile the en language file.
Click the little "en" in the upper right corner. For changes to take effect. You should do this after each change.
And depending on your browser a simple refresh you may or may see more not see the changes.
Some browsers you will have to close all windows and tabs completely.
Then start up a completely new browser session and go back to your forum to see if the changes worked.
If you have a uniquely named template that you installed you may have to edit the corresponding folder for it and recompile language file. Not 100% sure about a totally unique template if it's not using uni extension. But any changes to the default this is how you have to do it to get the changes to update.
If so be sure you are editing the right location in main.css
Then you should go to your main dolphin admin panel then to plugins orca forum/administration area. Then you have to recompile the en language file.
Click the little "en" in the upper right corner. For changes to take effect. You should do this after each change.
And depending on your browser a simple refresh you may or may see more