After making an account on your projects page make click on "+ - Add project", a new popup will appear.
On that popup select from what we will retrieve your code (right now only Git is supported) and the URL to it.
In the case of a Git repository, if the repository is private select "Private repo" and write your username and git personal token (one that's allowed to read the repository).
As the information is entered the same modal will check whether the repository is valid and can access it, and once it has been validated, the button create will be enabled. Just click it and a new project will be added.
If you click on your new project you'll get to the project details where you can click the button "Build", the "Build" button will keep glowing while the process is being performed in the background, take into account that this is a lenghty process and can take up to half an hour.
Finally, when the build button stops glowing and return to its original state you can visit your new constructed documentation via "..." and then clicking on "Go to documentation...".
Once the project is created you can just go to it's project details page by clicking it in your project listing and then clicking on the button "+ - Create guide", this will take you atuomatically to a new page to edit your guide using an intuitive document editor.