The Friends List is a list of KeepandShare user names that is the universe of users whom you want to be able to visit (and also to share information with).
To visit a friend, click on the gray Visit tab:

You will then see a list of friends to visit:

Click on any blue user name from the Friends list to navigate to that user's share page. Once you are at the share page you can use the links at the bottom to navigate to any information shared with you.
To add new entries to the list, click on the Find Username command. It displays matching names, usernames and allows you to add them to the Friends List or just to visit their share page.
To remove an entry from the list, click on the green Remove link next to each name. When you remove a friend they are also automatically deleted from any share groups you had placed them in.
On the right side the "Visit Others" section gives links of people you have recently visited but who may not necessarily be on your friends list. It's a kind of 'bread crumb' trail that makes it convenient for you to easily find someone again.