You can search and replace text, decimal numbers and hexadecimal numbers. Choose text if you
want to enter text characters. Choose decimal or hexadecimal numbers if you want to search and
replace byte values.
If there is a selection, a checkbox with the text Replace within selection only will be shown on the replace window. When you check this box, the search and replace actions will apply to the selection only.
Click on Replace All to replace all occurrences at once, within the selection or, if applicable, in the whole file.
You can also use Replace when the file size is protected with Keep File Size at... of the Options Menu. Then, the replacement will only take place if the find data and replace data have the same length.