A difficult question because it depends which part you want to change. But basically each item in the recent post widget is given a class of ‘spListItemTag’ so probably best to start there. And don’t forget that any styling needs to be added to your WordPress theme CSS as SP styles are only loaded on the forum page itself.

If you use your web browser console you can see what rules are being applied and even try out styling on the fly to see what things will look like as you make changes.

Ok, please have a look here. Look at the sidebar. the recent widget is appearing at the very bottom, its a black side bar so the dark grey text is hidden, and I would like to change the color for the topic titles appearing without changing the actual forums. Any advice? :O 

The topic name has a class of ‘spListTag’ so start with that. You can see this with your browser console tools.