First, add the images to be renamed to the list. You can either use the selection dialog, or add the files/folders using drag and drop onto the program interface.
Click on the button featuring the plus (+) symbol to add the action Replace to the action list.
The next step is to specify the part that should be replaced by the numbering. If, as in this example, the entire file name should be replaced, select the entry The Whole Name from the menu.
In the action menu select the type Consecutive Numbering.
If necessary, you have the possibility to customize the numbering. For example you can set the initial value or the number of leading zeros.
In the preview list, all changes are shown in real-time and are checked for errors (e.g., duplicate name) to avoid possible conflicts.
If there are no conflicts, the Tasks dialog can be opened by a click on the Apply button. All files/folders to be renamed are listed there and the renaming process can be started by clicking on the Start button.