Start on your homepage of Ancestry.com
Find the DNA Menu at top left
Select your DNA results page, then select the settings option.
On the settings page at the top is where you can link your DNA results with your tree.
Scrolling down on the settings page takes you to the Share your DNA match settings.
Scrolling down on the settings page takes you to the Share your DNA match settings.
You can invite someone either with their e-mail address or Ancestry.com Username.
To make the invite enter the correct information and select a role for them; unless you have a high trust level, guest role is sufficient.
If you have setup a sharing, you access their DNA matches from your DNA results page.
From your DNA results page, select from the list of View another test.
When selected from the list, you will open the person's matches on your computer screen.
You will be able to use your searching and view all available DNA matches.