How can I run the interactive notebook

I've install Julia and jupyter notebook. After that what should I do? 
 I don't understand
> install the package and open the tutorials like:

Is it a pakcage manager or something else?  How can I install that package?
Where should I type in the command
```
using Pkg
pkg"add https://github.com/JuliaDiffEq/DiffEqTutorials.jl"
using DiffEqTutorials
DiffEqTutorials.open_notebooks()
```