Yes you can do that stuff. It is nice to have a basic knowledge of HTML for this.
For many colors, fonts, etc. you can edit those in the css file. Go to your forum directory and then templates/subBlack/subBlack.css. The colors there are all in HEX so just search google for hex colors. To add bits of text in at different places you must edit the .tpl files. They are all also in the same folder as the css file. Each file is name for the basic page that it is, and it is pretty simple to figure out which one you want to edit. For editing them the best thing to do is to probably search through the file for a unique piece of text right next to where you want to add something, and then add right after that. This is where some knowledge of HTML is needed. A good place to learn HTML is w3schools.com When you get to the HTML tutorial if you want to get into it fast so that you just know where to add the text in then going straight to the tables section is probably the best, after learning <br /> that is lol, and then thats all you basically need to know to just add lines of text.