# How to install CO2System.jl package
**URL:** https://discourse.julialang.org/t/how-to-install-co2system-jl-package/68817
**Category:** General Usage
**Tags:** package
**Created:** [September 27, 2021, 3:30pm UTC](https://discourse.julialang.org/t/how-to-install-co2system-jl-package/68817 "2021-09-27T15:30:19Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@leon](https://discourse.julialang.org/u/leon)
#### Post date: [September 27, 2021, 3:30pm UTC](https://discourse.julialang.org/t/how-to-install-co2system-jl-package/68817/1 "2021-09-27T15:30:19Z")
The package is located here: [https://github.com/mvdh7/CO2System.jl](https://github.com/mvdh7/CO2System.jl).
According to the installation instructions, I should install the CO2System package as below:
`pkg> add https://github.com/mvdh7/CO2System.jl`
My question is how do I change to the pkg mode? I tried the below and it did not work:
```julia
using Pkg
Pkg.add("CO2System")
```
Many thanks.
---
### Author:  [@fredrikekre](https://discourse.julialang.org/u/fredrikekre)
#### Post date: [September 27, 2021, 3:33pm UTC](https://discourse.julialang.org/t/how-to-install-co2system-jl-package/68817/2 "2021-09-27T15:33:48Z")
> [@leon](#):
>
> My question is how do I change to the pkg mode?
You press the `]` key. Alternatively you can use
```julia
using Pkg
Pkg.add(url = "https://github.com/mvdh7/CO2System.jl")
```
---
### Author:  [@leon](https://discourse.julialang.org/u/leon)
#### Post date: [September 27, 2021, 9:39pm UTC](https://discourse.julialang.org/t/how-to-install-co2system-jl-package/68817/3 "2021-09-27T21:39:17Z")
> [@fredrikekre](#):
>
> `Pkg.add(url = "https://github.com/mvdh7/CO2System.jl")`
I’m able to install it now. Thank you so much!