Select the 'Find & Replace Text' button and the following text entry window appears.
Text to Relace: - Enter the text string to search for
Replace Text With: - Enter the replacement text
Search on Layer: - Search on a specific layer, the current layer, or ALL layers
Search on Level: - Search on a specific level or ALL levels
Match Case - Option to Match only exact case matches
Match Whole Text - Only match entire string matches, exact matches that are part of a string are ignored
Find Next - Move to next match
Replace - Replace the current match with the replacement text
Replace all - Replace all matches within the drawing with the replacement text
When The 'Find tab is selected the display of the box changes as shown below. The features are as described above.