I’ve visited your site and I saw there was no side bar. Make sure your sidebar is active first (DASHBOARD -> APPEARANCE -> WIDGETS). Then pull The widgets you want to display in the Sidebar section. Give the Widget a Title, the title will then display in the Sidebar area. To style any element you can inspect the element by right clicking on it -> select inspect element -> a window will pop-up showing you the div class or div id of any element on that page. eg(#bbpress-forums div.bbp-the-content-wrapper textarea.bbp-the-content). This div comes from inspecting the elements on this very page. You can even change things in the right-side window of the inspector and see the changes happen instantly. Elements like background-color, text color and font size and so on.(TRY IT)
You can place this div inside your themes CSS file and change the elements within it. Example text color, font, font-weight. eg
#bbpress-forums div.bbp-the-content-wrapper textarea.bbp-the-content {
from width: 100%; to width:50% !important;
from margin: 0; to margin: 10px 10px 10px 10px !important;
from font-size: 12px; to font-size:14px !important;
}
the !important is used to override the styles already created within the plugins css
You can also see an entire page by using right-click -> view page source
