The following options will appear above, here I will explain them before we take the next step
1 - Run Injector: It will continue to inject the files you put in the "files to patch" folder.
2 - Undo last changes: As he already says, he will redo the changes that occurred in the pad00000.meta file, but it won't be completely, it will be since the last backup file.
3 - Restore Backup: As the name implies, it will restore the backup so that it is clean as if it was the first time it was created, thus removing all modifications.
4 - List patched files: It will show you the list of all files that have been modified in this pad00000.meta file
5 - Prevent file Recheck: Unfortunately I have never used this option, if I find out which server I will change this description for.