On your Profile tab, tap the Skills section. Tap on a skill, Loving-Kindness for example, to see information about the skill itself as well as the benefits of that skill. You’ll also be given a list of the singles in which this skill is practiced.
Additionally, each skill has its own icon! When you open a day within a plan, the Skill icon will appear above the duration choice. If you look for the icons to match the Loving-Kindness icon, you will find plans that deal with this skill, as well!