ios-home-iconThe Home button in the top left corner brings up a menu for accessing all local (iPad/iPhone) and cloud (such as Dropbox) LaTeX files and for customising the editor.
ios-share-iconThe Email button adjacent to the Home button allows you to send current LaTeX and/or PDF files as an email attachement.
ios-search-iconTap the Search button to hunt for a search term in all open files. If you are familiar with regular expression (regexes), any term surrounded by forward slashes will be interpreted as a regex, for example searching for /state[sd]?/ will return instances of state, states and stated.
ios-typeset-iconThe Cloud Typeset and Local Typeset buttons initiate the typesetting. When using the cloud option, for the duration of the typeset, the button morphs into a Cancel... button. Press this to cancel a typeset in progress.
ios-bug-iconPress the Log button to view any errors or warnings raised by LaTeX during the previous typeset.
ios-preview-iconTap the PDF button to see the PDF created by LaTeX.