To show the search bar click on Search > Search Bar menu item or press Ctrl+F shortcut.
Use Search for text field to find incrementally the occurrences of the typed text. TextFlow shows on the fly the search results.
Use the left arrow button to jump to previous occurrence and the right arrow button to jump to the next occurrence. You can also use Ctrl+Shift+G and Ctrl+G to jump to the previous and next occurence respectively.
The Regexp checkbox enable or disable regular expressions in the incremental search.
To show the replace bar click on Search > Replace Bar menu item or press Ctrl+R shortcut.
The behaviours of Search for text field, the next/previous buttons and Regexp checkbox are the same of the Search Bar.
Use the Replace with text field to specify the text that will replace the found occurrence.
Use the Replace button to replace current occurrence with the text in Replace with text field.
Use the Replace all button to replace all occurrences with the text in Replace with text field.
To show the goto line bar click on Search > Goto Line menu item or press Ctrl+H shortcut.
Use the Goto line text field to specify a line number.
Press Enter to jump to the line in Goto line text field.
Use Ctrl+8 shortcut to find the next occurrence of the current word where the cursor is positioned.
This operation opens the Search Bar then you can use all its features.