Yep. The easiest way is to find the folders you want, then go into customize mode (Settings -> Customize Toolbars) and drag the folder(s) to the toolbar. That will create buttons which go to the folders when you click them. (Click OK in the Customize dialog to return to normal mode so you can try out the new buttons.)
Have a look at How to backup or locate your Opus configuration (Simple).
If you have any more questions or need more detail for either of those two, it's best to start a separate thread for each one, so it's easier to keep track of the conversation and to help people who come to the forum searching for the same question. (Guidance here.)
Happy Opussing! 