Firstly, login to the account and view the documents
Tap on the receipt/invoice you wish to edit
<span class="">Tap <i><b>Edit</b></i> for that document</span>
Tap in whichever field(s) you wish to modify
To add a category or account code, tap in <i><b>Categories</b></i>
You'll get a drop down menu. Tap on the right category(s)<br>
Press Back when finished
Click <span class=""><i><b>Save</b></i>. And that's it!</span>