<p>Click on the Upgrade button

and then choose the Fields icon
</p>
<table style="text-align: center; background: #4CC552; border: #348017 2px solid; margin: 1em auto;"><caption>
</caption>
<tr><td style="background: #339933;">

</td><td colspan="19" style="background: #339933;">
<span style="color: darkgreen;">Upgrades</span>
</td></tr><tr><td style="background:#339933;">

↑ ↑
</td><td>

</td><td>

</td><td>

</td><td>

</td><td>

</td><td>

</td><td>

</td><td>

</td><td>

</td><td>

</td><td>

</td><td>
CD
</td><td>
PAB
</td></tr></table><p>If you have enough <span style="white-space: nowrap;">
Coins</span>, <span style="white-space: nowrap;">
Favors</span> and high enough
Level then you can purchase the Level 1, 2, 3, 4, or 5 version of it.
</p><p>See
Field for the appropriate amounts needed for each Field Level.
</p>