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Try completing the following steps from your Apple Watch itself, to customize this complication.
1: With the watch face showing, touch and hold the display, then tap Edit.
2: Swipe left all the way to the end.
You'll find complications on the last screen.
3: Tap the complication to select it, then turn the Digital Crown to choose a new one—Today's Date, for example.
4: When you’re finished, press the Digital Crown to save your changes, then tap the face to switch to it.
You can find these steps along with other information you may find helpful, here: Customize the watch face
Cheers!