Customizable?

Im reading in these reviews about this app being wonderfully customizable and other things I havent seen. So I guess more instructions would be nice so I can know about all these great features.

Ive only had this less than a week. So far I do like it. But I seem to only have noticed the very basics.

shihtzumom about My Pain Diary: Chronic Pain & Symptom Tracker, v3.5.5