On the showcase you can search by typing in the search box (1) and clicking on one of the search buttons (2) to choose to search by All (searches description as well), Tags (as added by the author), Title or Lead Author.
You can also filter the view by clicking on one of the red programme filters (3) added by the conference. And if your conference has been using Learning Toolbox for several years, then you can also use the drop down menu (4) to switch to view stacks/ePosters from another year.
Alternatively you can browse by simply scrolling down the showcase screen. More stacks/ePosters will appear as you scroll down the page.