To edit meal details on your Journal:
Tap the ... button on the meal you wish to edit
Tap "Edit Meal"
Rename the meal and/or customize the meal level macro goals
These changes will apply only to this particular meal on this particular date.
You can customize your daily recurring meals by editing your Daily Goal:
Tap Goals (the
icon)
Tap into your goal
Scroll down the Goal Meals section and make your edits (rename, add meal-level goals, re-order, add new meals)
Tap the
in the top right corner to save your edits.