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First method:

1. Select the picture.
2. On the ribbon menu, click the tab Format under Picture Tools.
3. Within the group Picture Styles, click Picture Border. From the drop-down, select the border color

Second method:

1. Select the picture.
2. On the ribbon menu, under the tab Home, within the group Paragraph, click the down arrow icon
3. Within the group Picture Styles, click Picture Border. From the drop-down, select the border color.
4. Select the image.
5. On the ribbon menu, under the tab Home, within the group Paragraph, click the down arrow button beside Borders. A drop-down list appears.
6. Select option Borders and Shading. Borders. Borders and Shading dialog box appears.
7. Under the tab Borders, select border type as Box. Select color and width of the border lines.
8. Click OK.

Shortcut key method:

1. Select the picture.
2. Press the ALT key and then press keys J P S O one after another.
3. Select the border color and press ENTER.