Tapjoy is not available for Appodeal SDK since v2.11.0 (Android), v2.10.3 (iOS).
You need the following information to link your account: Publisher Reporting API Key, SDK Key, Tapjoy Ad App ID.
Publisher Reporting API Key: In App Settings click on App info. Go to the bottom of the page and find API Keys. Publisher Reporting API Key is provided among other keys.
SDK Key and Tapjoy Ad App ID: SDK Key and Tapjoy Ad App ID are located in App info as well. Click on Application Platforms and find both next to each other.