I am trying to create a backlog but i cant, i dont find the place to add storys/tasks to it. Where i can add items to the backlog?

The backlogs plugin will be published after this sprint. It is not yet available for download.
To test it in the sandbox project, you can create a new product backlog or sprint backlog in -> Project settings -> Versions

Choose whether it should be on the left or right of the backlogs view.

Hello again birthe :)
Thank you! i really appreciate it!