If you've signed up to Kyso with Github you will already be connected and you should see all your public repositories. If not, just click the Connect Github button. Using the dropdown on the right you have the option to authorise all your Github repositories or just your public ones (the default). It is not possible to authorise just one repository at this time given the way Github's OAuth authorisation works.
On the Github OAuth page you will have the option to authorise your own account and any organisations you may be part of.
Once Kyso has been authorised you will see a list of all your Github repositories, which you will be able to search and filter. You can import any given one to Kyso by clicking Connect to Kyso.
From then on whenever you push a commit to Github it will update the sister post on Kyso.
If you only want to authorise a single repository, please read the guide below: