The default Visual Editor may not work as expected on iPad's Safari browser. Try using the Text Editor!

You may change to the Text Editor in two ways:

1) Select My Account on the upper-right hand corner, scroll down to Your Settings, set Use Visual Editor to No, and press Save. Each time you edit your wiki, you will automatically be in the Text Editor mode.

2) Go into edit a page, select the arrow on the Save tab, and select Text Editor. This has to be done each time you go into editing mode.