InDesign is software from the Adobe suite. You can, thanks to it, add borders, called "outlines", around your content. This feature is present on the Windows and Mac version of the software.
Steps

Step 1. Open InDesign
The software icon is a black square with a pink outline and "Id" inside. The InDesign startup window will appear.

Step 2. Click Start in the upper right corner
A drop-down menu will then open.
- If your computer has a touchscreen, you will need to click Touch.

Step 3. Select Typography
This option can be found in the menu Start and allows you to arrange the workspace in the way most consistent with the work you are going to do.

Step 4. Open a project
Click on File then on To open. Then select the document you want to work on.
- You can also create a new document by going to File and then selecting New then Document….

Step 5. Select an object on your document
Click on the element on which you want to add a border in order to select it.

Step 6. Click Swatches
This small window is located to the right of the software.

Step 7. Click the Outline icon
It is located in the upper right corner of the Swatches window and is shaped like a box with a border. This action will bring up a list of colors below.

Step 8. Select a color
Choose the shade that suits you from the list.
If you double-click on one of the shades, a window will appear and you can modify it

Step 9. Click Window on the top bar
A drop-down menu will then appear.

Step 10. Click Contour
This function is at the start of the list and opens the Contour window.

Step 11. Adjust your borders
In the Outline window, you can adjust the characteristics of your borders.
- Thickness: the "Grease" text field increases the thickness of your border. You can enter a value by hand or use the arrows to the left of the field.
- Form: click on Type, then choose the shape you want.
- Space color: if the type of border you have chosen is composed of separate elements, you can assign a color to the space between them using the "Space color" option.

Step 12. Save your document
Click on File, then on Save to save the changes made.
- You can also use the command Save as … to save while keeping a copy of the last saved version of your document.