This is a fresh installation. The program will try to find appropriate values automaticaly. Only change them if you know what you are doing.
The names of pages will be added after the base URL of your YesWiki website. Delete the "wakka.php?wiki=" only if you use redirection (see below).
The "automatic redirection" mode must be select only if you are using YesWiki with redirection of URLs (if you don't know what it is, don't activate this option).