1. Create Microsoft account to get access to Azure (if you don't have one). You can create account here: https://azure.microsoft.com/en-us/free/ . One of the steps during registration is to choose your payment method, so choose Pay-As-You-Go. In this case you will pay only for using paid services. Bot creating according for this scenario is free.
2. Log in with your account in Azure.
4. After choosing "Create", "Bot Channels Registration" window appears where you should fill in the information fields:
You can get "Messaging endpoint" during channel creation in bpm'online.
Steps to create channel in bpm'online:
5. Now you need to get your ApplId and AppPassword of created Bot.
A new window appears, where you probably need to log in again. After entering password you will see application managing window.
To get AppPassword press "Generate New Password". Save this password.
6. Next, add bot to the Skype channel in Azure and press "Save". New channel will be created.
Choose "Skype" blue button to get your bot link.
7. Use your AppId and AppSecret in bpm'online during adding Skype channel, channel weight and press "Add" button.