Once your site is successfully imported to Forestry, you will be presented with your site dashboard. Click on Customize to access the customizer. You are now editing the data file that controls the look and contents of your landing page.
At the top of the screen, you will see the toolbar.
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This indicator shows that you have made changes to this data that has not yet been saved. Clicking on this will give you the option to revert your content back to your last save.
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Click the eye icon to open a preview of your landing page.
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Click this button to save your changes.
The customization options are broken up into two sections: Appearance and Content. Click on one of these panels to edit the relevant section.
When editing values in one of these subsections, click the back arrow 
next to the section title to return to the top level.
Click the Add link button to add a new empty link. Click on the item you just created to edit the link details.
Clicking on the three lines 
on the left side of the box will allow you to reorder links by dragging and droppping.
Clicking on Site Config will give you access to the site configuration options.
When you're ready to make your website live on the internet, you will want to update the value of Base URL. Until then, feel free to remove the existing value and leave it blank.
The preview of your page in Forestry is not permanent. Do not share this URL! To create a permanent URL for your landing page, you will need to set up hosting.
This project is pre-configured for easy setup with Netlify. Sign up with them and import this project with the default settings.
Remember to change or remove the value of baseURL in your Site Config. If the page deployed by Netlify doesn't look right, you probably forgot to do this.