The goal of this page is to give you some ideas how you can use this skill.
If you successfully installed the skill, you should be able to open views with a command like
Alexa, tell dashboard viewer open page <number>
While this of course works, it is a bit inconvenient because you need to memorize a number for each view. Therefore, I use routines to invoke the skill. Just use the "custom" action in the routine and type in the command you would normally use to invoke the skill, e.g.
Alexa, tell dashboard viewer open page 3
This way the routine basically acts as an alias for the skill command. As a bonus, you can also instruct Alexa to say something (e.g. "OK") before opening the view.
You can use the Alexa Media Player to open a view on the Echo Show from Home Assistant (e.g. in an automation). This custom component makes it possible run routines from Home Assistant (how is described here) which then can be used to invoke the skill as described above.