If you are not connected to the app, you may not see the complete choice of trigger events and fields. This is especially true of highly customized apps such as Salesforce. There are two ways to connect to the apps..
1. The connections choice from your profile at the top right
Selecting connections, take you to a screen with all your connections. You can create a new connection or choose an existing one..
2. The other way to connect to the app is from the App connections block at the bottom of the recipe screen