The guidance below has been superceded by a PDF User Guide which you can download using the above link.
Start the App. Click on Sample Tree in the Family Trees list. Click on any of the people in the People list. The next Person page shows relatives on the person you selected - father, mother, partners and children. You can click on any of these relatives to jump to their Person page.
At the bottom of each Person page are three square regions labelled Family, Ancestors and Descendents. Touch any of these to expand it into a full sized view. A long press any person's name in a full sized view will bring up a list of options allowing you to navigate to another view for the selected person or back to the People list. In the Descendents view a tap on a (non-grayed) person's name redraws the view showing the relationship of each (non-grayed) person with that selected person.
At the top right of each full sized view is an Action button. Click on this to create a PDF of the view. (If you have not yet unlocked the PDF creation feature, you will be prompted to do so.) The PDF will be a single page large enough to contain the full sized view or to multiple pages that can be joined together to create a full sized print. You can save it to iBooks, AirDrop it, email it, print it, etc. If you want to try printing before you permanently unlock the PDF Creation feature, do so the Sample tree provided with the App.
To export your tree from the Ancestry web site, click on Trees and select the Create and Manage Trees item. Click on the Manage Tree link for the tree you wish to export. Click on the EXPORT TREE button. You will see the Generating a GEDCOM file message. The Export Tree button will then become a DOWNLOAD YOUR GEDCOM FILE button. Use this button to download the exported file.
GEDCOM files can be transferred to your iPad or your iPhone using AirDrop, or you can email them to your device and click on the link in the email. Your device will ask you to Accept the file and the Tree Views App will copy it into it's own directory.
You can delete a tree by swiping left in the tree view list. If you delete the Sample Tree, it will not show again as long as there are other trees present. If you delete all trees, then the Sample Tree will reappear when you next start the App.