To cancel Skype:

1. Sign in to your account by clicking here
2. In the Manage features section, click Skype Number.
3. Click Settings, here you can select to cancel your Skype Number subscription.

OR

1. Sign in to your account by clicking here
2. On Windows, in the menu bar, click Skype -> Profile -> Edit Your Profile… Or on Linux, click your Skype Name and select Edit Profile… Or on Mac, click File -> Edit Profile…
3. Remove all of your personal information