In image view | editing mode, click button Add Text on Editing Panel, a dialog allows you to choose the input the text on the image.
1.Input the text and choose the font properties like font type, size & color etc.
2.A box hover on the image can be dragged and you may move it to the right place you want to put the text.
3.Click OK or Apply to apply the changes.
To save your editing, please click button Save in the toolbar on the top.
To undo or redo your editing, please click the tab Editing History on the bottom of Editing Panel, all your editing history is listed and click one of them to roll back.