Not understood yet

Hi!
Can you explain me step by step what to do?
1) At Google Adsense account I must to create the mobile ad block. What kind of Ad? Which Ad format? Single or double? Impossible to choose the size…
2) At plugin settings:
Enter your google_ad_client ID here: ca-mb-pub-1000000000000000 or mb-pub-1000000000000000 or pub-1000000000000000?
Enter your google_ad_slot ID here: understand.
Enter the ad width/height here: here I can choose any size of mobile Ads?

Tried different ways, but field for Adsense is blank…

PS. Maybe change the code of the plugin a little like that:

44. ?>
45. <div align="center"><?php return $content . $ads; ?></div>
46. <?php

to center Ads?