If your looking to get additional items into the header of the page, it depends upon the item your placing there. For things like Google Adsense & Twitter you'll need to take a different route:
Open templates/tmpl_uni/_header.html
Locate the area you would like the item to appear in, you want it on the same line as the Login/Join Now in the header but next to it instead of over/under the login/join now, then do this:
Find this code:
<div class="topBlock">
__main_logo__
__hello_member__
</div>
Add this line below it:
<div style="position:absolute;margin-top:0px;margin-left:0px;width:1px;height:1px;">
</div>
Place your items code in between the <div... & </div> tags. Now this is where Dolphin gets fun, you can move your item around the entire logo area above the menu by simply playing with the px counts & such inside of this box.
By increasing margin-top:..px; you can lower the item, by increasing the count on margin-left:..px; you can move it to the right. Obviously working with height & width with increase the space the item has to appear in. By using this simple line of code for each item you wish to add you can quickly add anything you want that links to a specific place, such as ads, adsense for search, twitter, skype and many other items. Note, if your adding an item that requires a page on your site you will still need to add that page for the link to resolve to, but this will allow you to place these links where you need them. It can also be used to place a logo script over top of a picture, to create splash pages and other little tricks that sites need and a lot of people want to charge you for. Just remember to close all tags and back up all files before you start editing.
Have fun playing with it and see what you can do.