To edit cells in spreadsheet: 

1. To edit a cell, double-tap on the cell. This will open the keypad for you to start editing. Alternatively, you can enter the data in the formula bar.

2. Once you've entered data into the cells, Tap the ✔ symbol to submit the edit. You can use the Tab button to move to the cell on the right.

3. While in the edit mode, you can tap the cells you want to edit and start entering data.

4. To stop editing, tap the X icon above the keypad.

You can switch between text and numeric keyboard using the respective icons displayed above the keypad.

Tap  icon to select the date and input it.