Your personal profile is your digital calling card in the horse world. Here you show who you are, your interests and which horses you're working with right now. Your personal profile is also where you manage and add your horses.
How to do it:
Go to your profile in the app and tap "Edit profile".
Here you can upload a profile photo and update all the information shown to other horse people.
This is also where you manage your digital stable under the "Horses" heading.