Help with setting up openssh for me to access my computer remotely, or even anywhere.

1. Install the "ssh" package;
2. If required, reconfigure your router so that it accepts UDP and TCP incoming packets on port 22 and forwards them to the correct machine on the private network (its private IP address should be constant);
3. Execute 'ssh user@hostname' from the remote computer where "user" is your login on the system you connect to and "hostname" is the name or the public IP address (e.g., if it has no name) of the computer or of the router that will forward the packets to the computer.

For a non-default configuration, see https://help.ubuntu.com/community/SSH