While using the practice website you will come across various buttons.
This page explains these:

Practice with DigiD – Explanation of buttons

Visit the website to practice with the DigiD app.
To do this, click on this link: Practice with the DigiD app.

On the home page, click on the tile  How do I install the DigiD? app?'.

To start the exercise, click on the arrow at the bottom right, pointing to the right.

If you are one step too far, click on the arrow to the left.
It is also possible to click anywhere on the screen for the next step.

To start the exercise, click on the arrow that is at the bottom right and points to the right. If you are one step too far, click on the arrow to the left. It is also possible to click anywhere on the screen for the next step.

By clicking on the speaker you will hear the explanation of each step.