In the desktop version of Imagink, you can save your current drawing by opening the drop down menu top left and by clicking on 

File > Save (Ctrl + S) or
              File > Save as... (Ctrl+ Shift + S)

You can export your creation also as a PNG, JPEG, PSD or a SVG format by opening the drop down menu top left and by clicking on 

File > Export...(Ctrl+E)

Select the export format and where to save it and hit save.

To export your MP4 video, select

File > Export video... (Ctrl + Shift + E)

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