Add Content
When you download the app for the first time, you will start with a blank, black screen.
To add content press the plus button in the lower right.
This will bring you to an entry screen, where you can input an epoch date to count away from or towards - day by day.
You can also input some text, which will appear below your day count. (There is a 25 character limit.)
After you press OK, this will appear as your first entry screen.
Options
If you press on the option button in the lower left, it will bring up a screen that allows you to select from eight colors, or the default color (in the middle).
If you want to modify the text color, or have a different default background color, you can hold down the option button.
This will bring up a screen that allows you to swipe-left through a selection of background colors, and two sliders - one of which allows you to set the darkness of the text (on a scale from white to black), and the other of which allows you to set the tone of the background color (on a scale from pure color to black).
Modify Content
From the local option screen, you can modify content by pressing the notepad icon.
This will bring up the same screen you used to add content. You can reset the epoch, or modify the text.
You can also delete the entry with the trash icon.
Remove Adds
If you don't like the adds, or just want a cleaner version of the app, you have the option to remove the adds by pressing "Remove the add banner!" (This button is both under the adds themselves,
and also on the information page.) This will take you to the App Store, for a purchase. If you have already removed the adds once, you can simply restore on other devices, or after an
update.
After you remove the adds, the status bar at the top of the screen will always be the same color as the local screen, as opposed to the default color.
You can download the app from iTunes.