Most Numbers templates include tables, text, and images that you can use as a starting point for your own spreadsheets. You can use or customize the templates’ design features—fonts, colors, cell data formats, size and location of images and tables, and so on—and replace the data with your own.
Go to the Numbers app 
on your iPhone.
Open a spreadsheet, tap the cell to select it, tap 
, then enter your own content.
When you’re done, tap return, or tap outside the text.
Go to the Numbers app on your iPhone.
Open a spreadsheet, double-tap the text to select it, then type your own.
When you’re finished, tap Done, or tap outside the text.
Go to the Numbers app on your iPhone.
Open a spreadsheet with an image placeholder.
Tap 
in the lower-right corner of a placeholder image, then browse for an image.
If you already replaced the placeholder image, but you want to change it, tap the image to select it, tap 
, tap Image, then tap Replace and browse for a replacement image.
Tap the image you want.
If you don’t see the image you want, upload it to your device and try again.
To change the part of the image that’s visible, resize the mask for the image.
To remove a placeholder entirely, select it, then tap Delete.