# SSH Keys management
To launch an instance on Sesterce Cloud, you need to link a SSH Key to it. You can paste your public key directly from the launching path, or [**via the Settings page**](https://cloud.sesterce.com/settings).
{% hint style="danger" %}
Currently, it is **not possible** to add a SSH Key to an instance already live. Make sure to add all keys you need before launching your compute instance. [You can add several keys to a single instance](#how-to-add-multiple-ssh-key-in-a-compute-instance).
{% endhint %}
{% hint style="info" %}
To generate your public SSH key from your laptop, open your terminal and type the following command: \
`ssh-keygen -t ed25519 -C "youremail@example.com"` . Then, type enter to select by-default saving place and use the following command to expose your public key: `cat ~/.ssh/id_ed25519.pub`
{% endhint %}
### How to mark a SSH Key as default?
To mark a SSH Key as default, click on the 3 dots icon an select "Make Default". This will automatically select the SSH Key when you'll create a new Compute instance.
### How to add multiple SSH Key in a Compute instance?
You can merge several SSH Keys by pasting the keys one after the other in the text field as below (make sure to brake line between the keys):
Then, select the SSH Key created to launch your instance. Both users will be able to connect to the Compute instance.
