Server side

First install the ssh serever

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sudo apt-get install openssh-server

Then look at the ip.

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ip r

The first ip appeared is the ip that you need to connect to.

You may need to edit the ssh server setting.

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sudo vi /etc/ssh/sshd_config

Find the line #Port: 22, remove # and change the port number to something else i.e. Port: 80

Client side

First ping the ip to see if it can be connected.

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ping <ip>

Then should be able to ssh to the computer directly.

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ssh <user>@<ip>