You can find Bookmark record by title or even from contents of Text and URL address.
Press 
Find View Button or press Command-~ to switch the View.
Find titles start with search text
Type the first several characters of title you want to find and hit TUB.
This find option will show only records which's title is started with characters you typed.
Press Directory area to see directory informatin of found record.
Press "Select" button to see the destination record in List View.
You can also "Edit", "Move", "Merge","Delete" and "Open URL" at the same manner within List View.
To go back to List View, press 
"List View" button at top right corner.
Find titles contains search text
Click 
button to use onother find method.
You can search titles contents the search text. Please enter search text then hit "Start Find". You can serch from URL and text too (option).
