If you only want to find text in a specific font,colour or size and don't care what the text is, un-tick the Find: check-box.
When un-ticked, any text matching theCharacter formatting will be found. Until you specified some character formatting restrictions, the Find Next button will remain inactive in this case.
Press Find Next to show the next occurrence of the search text from the current place. Each time you press Find Next, Infix Pro PDF Editor will zoom-in on and select the text found if Zoom-in on results is ticked.
Press Find All to show the Results list which will display all the locations where the search text is found.
Double-click on an entry to view that entry in the document. If you are searching through a portfolio, the third column in the results table will show the name of the document within the portfolio in which the text was found.
Hit Replace >> if you decide you want to replace as well as find the target text.