If you want to activate your Airbnb as a channel you need to add your account in the Channels module. To do that follow the instruction below:

Go to Channels in the left sidebar menu.
In the top right corner, click on Add channel.

Then, you should select the Homeaway/VRBO provider.

Now you can edit the channel name, the currency and type your VRBO assigned id.
Do not forget to Save in order to keep your changes.