Re: No editing allowed
If you get a 404 error when you try to access tiki-editpage.php, then it seems the file is missing and your installation is not complete.
The absense of the edit link on wiki pages ordinarily would mean a permissions problem — that you don't have the permission to edit wiki pages. But if are sure you are in a group that has the tiki_p_edit permission assigned, then maybe there is a deeper problem.
I would first be sure all Tiki files are installed correctly and that the database structure and default data are complete.
-- Gary - themes.tw.o