Samsung PN51E550 E-Manual page 44

2. Enter a keyword using your remote.
The keyword should be part of the
name of an application. For example,
enter f-a-c-e to search for Facebook.
3. When done, select at the bottom
of the keyboard.
4. Wait until the search result screen
displays. After Samsung Apps
displays the results, you can select
an application you want in the search
result screen.