You can edit the textbox by long pressing on the textbox that you want to edit or simply using the lasso tool.
Editing textbox using the long-pressing
You can enable the editing mode by long pressing on the textbox that you want to edit.
Delete textbox
If you press the delete icon on the pop-up menu, the textbox will be deleted.
Move textbox
To move the textbox, press and hold the move icon and move to the place where you want to put the textbox.
Edit the text in the textbox
To edit the text, press the textbox area with your finger or a stylus while the editing mode is enabled. Then the virtual keyboard will pop up.
Editing textbook using a lasso tool
You can simply select with a lasso tool and edit the textbox as well. You can use the lasso tool by pressing the icon on the pen toolbar.
To select a textbox with a lasso tool, the textbox option should be enabled.
Press the lasso tool icon while the lasso tool is enabled to open the lasso tool options. Check if the textbox option is enabled.
Delete textbox
If you press the delete icon on the pop-up menu, the textbox will be deleted.
Move textbox
To move the textbox, press and hold the move icon and move to the place where you want to put the textbox.
Edit the text in the textbox
To edit the text, press the textbox area with your finger or a stylus while the editing mode is enabled. Then the virtual keyboard will pop up.