You can't. Skype is disappearing.
771 votes52 comments · Public » Apps, Connectors, Messaging Extensions · Flag idea as inappropriate… · Admin →
This is in the works, please see our announcement post from Ignite!
We have raised the priority of this work item, and it is currently being worked on. We don’t have any dates to share at this point, but will update when we have new status. Thank you!
It's been more than two years, come on.