Tapping the friend will take you to their profile page and you will be able to see their sstats and caches on the same basis as your User Profile page.
Alternatively you can tap this link - Authorizations and scroll down to the Authorized Developer Authorizations section. Once there you will need to check the “Allow Authorized Developer applications…” checkbox in order to enable Friends in Cachly.
Please note that your friends must also check the “Allow Authorized Developer applications…” checkbox. If they do not then you will not be able to see their information.