Add / Edit / Delete lines on my invoice

Open an invoice or create a new invoice
In the middle of the page there is a section for the invoice lines
To add a new line, start typing the details in the yellowy / orange row and then either click in the white space of the invoice, press tab or press enter on your keyboard to add another line
To edit a line just click in the text area you want to edit
To delete a line use the cross at the end of the line
Click Save when you are finished