Chartboost is not available for Appodeal SDK since v2.11.0 (Android), v2.10.3 (iOS).

You need the following information to link your account: User ID, User Signature, App ID, App Signature.

User ID and User Signature: Go to Dashboard and click on Tools tab. Choose API Explorer. User ID and User Signature are under Authentication. 

App ID and App Signature: Go to Dashboard and click on App Settings. Choose Basic Settings. App ID and App Signature are located on the right side of the page.