You can type in either artist, album or file name into the search box. The sidebar with file type, album name etc that's in LW 4 isn't in LW 5.

If you use Classic view, you can enable the album column. Choose Audio from the file types above the column header & then right click on the column header to choose which cloumns to show.

If you want to refine results, type the album name into the text field where 'Refine results' shows... now you'll see all results from whatever album you chose.

Also check out the wiki for more info about LW 5 (User Guide & FAQ)...quite a few things have changed.
User Guide - LimeWire