Hello! Leonardo Reyes
1. To use the cross icon you can simply replace <i class=”fas fa-check”></i> with <i class=”fas fa-times”></i> inside license features or if you do not want to use icons you can simply use ✕ mark.
2. We are sorry we do not have a button feature but we will work that on the next update for sure.
but you can apply “Read More” this code in template-parts/frontpage-sections/pricing-table.php on this file on between line 116 and 117.
You are welcome, Hope this helps you.