Set Amember File / Folder Permissions

Once i configured amember on the server, file permissions were 777 and i dont want to make them writable for all.

So how can i change the file/folder permission for amember without affecting any settings i have done.

Also tell me which files/folders within amember needs 777 permission, so that i can change rest files/folders to more secured one.

Thanks in advance.

The only folder that needs 777 (or 755 on some systems) permissions is "data" and "templates_c"