I know its probably very stupid question, but not sure what it means:
-Go to “Options” administration menu, select “WP-Cache” from the submenu, the plugin will try to autoconfigure everything. The plugin will try to autoconfigure everything and guide you through the process. In case of failure –normally due to the lack of files’ privilegies– it tell you and give the instructions to solve the problems.
Have activated chache, but WHERE IS "OPTIONS" and which 1 is administration menu??