Collapsible More Link Not working in 2.0

I’m using this version

https://www.chroder.com/archives/2005/12/28/wordpress-plugin-inline-collapsible-more-link/

which is compatible with 2.0

but it’s not working for my site

https://liberta.espoireve.com/page/2/

the first entry of this page

there is a show more link there i click it, it links to the permalink of the post instead. any idea?

Is there suppose to be a quicktag of it in the admin panel? I don’t have it.

thank you ??