you need to edit your theme css file… I dont know which theme you are using… for example, if using default theme, you would want to edit wp-content/sp-resources/forum-themes/default/styles/default.php
or you can use the sp theme editor on forum – themes – edit theme… and select the main theme css file…
after you edit your theme, go to forum – toolbox – housekeeping and clear the combined css cache so it rebuilds with your changes…
as always, we strongly recommend you have your own theme and not edit one of ours so you dont lose changes on updates…


