Mintegral is not available for Appodeal SDK since v2.6.2 (Android), v2.10.3 (iOS).
You need the following information to link your account: Skey, Secret, App Key, App ID and Ad Unit ID.
Skey and Secret: On your Dashboard click on Account and choose Company Info. Skey and Secret are under Reporting API.
App Key, App ID and Ad Unit ID: On your Dashboard click on APP Setting. App Key is located in the upper part of the page in brackets. App ID and Ad Unit ID are located one after another in the main body of the page.