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

You need the following information to link your account: Account id, API Key, Placement ID, Site ID.
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​Account id: When you login to your aсcount, go to Monetize. Next to your registered email there is an arrow that you can click on. In the appearing menu Account id information comes first. 

API Key: Click on the arrow next to your registered email and choose Account Settings. Click on API Key and then choose Generate API Key. 

Placement ID and Site ID: Click on the app and choose Placements. In the pop-up window Placement ID and Site ID are next to each other in the upper part of the window.