You need to connect your computer to your GitSwarm account through SSH Keys. They are unique for every computer that you link your GitSwarm account with.
Create an account on GitSwarm. Sign up and check your email for your confirmation link.
After you confirm, go to GitSwarm and sign in to your account.
On the left side menu, click on "profile settings" and then click on "SSH Keys":
Then click on the green button "Add SSH Key":
There, you should paste the SSH Key that your command line will generate for you. Below you'll find the steps to generate it:
Go to your command line and follow the instructions to generate it.
Copy the SSH Key that your command line created and paste it on the "Key" box on the GitSwarm page. The title will be added automatically.
Now, you'll be able to use Git over SSH, instead of Git over HTTP.