Ruby on rails plugin

I´m new in Ruby on rails. I´m trying to write a plugin, place in in project menu, and insert some data per projects. but there is a problem in my plugin. I have written the plugin, and add a tab in project menu. the plugin show something, but now I wanna edit the data. in the page index.html.erb, show data. I have added a link to edit data. I add a page edit.html.erb. but when I click on the edit link, show that the page can not found. Can anyone help me_