First of all, make sure you are in Edit mode of your dashboard.
Then find the right sidebar, and click on the Add text widget button.
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Then, in the Add text widget segment, select Upload and hit Next.

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After that, select your image file, and if you wish, you can add a description of your widget.

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The next step is to put in your Widget Title, select the widget size, and select the “Regular Card” option from the drop-down menu.

Don't forget to click submit at the end.
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NOTE: You can also use markdown for all passive widgets and footers. 

Learn all about text widgets here.

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