It probably made another instance since that one existed already. PS. I responded to your other post.
Try putting localhost\V11.0 in the connection string or try (localdb)\V11.0
localhost\V11.0 does not work
Now i did this,
When im connected to (localdb)\V11.0
I have create a new Database:
Can i connect Samba with that?
And make every change i want, insert products en everything
then export the database and inport it to the new computer? 
No you should not. This will not work. Samba creates the databases itself. Its not connected to that instance or it would chave created a database.
Did you read my response in the tutorial?
When you installed Samba did you select localdb option?