Step 1: Choose Sign in à then Use Skype Online
Step 2: A screen of skype for web will appear, you need to provide your name and password for login.
Step 3: After logging in successfully, you will find the interface of skype for web that is identical to that of skype app.
All of the features of skype for web such as calling, adding new members in a group chat are similar to those of skype app. Therefore, wthere is not need to install skype app on your computer to sign in your skype account on web. Good luck!