Change " Subscribe to our newsletter" confirmation page

[Katharina_be]

Hi Community,

I would like to change the layout of the newsletter confirmation page by adding an image.

https://www.betanics.de/account/subscribe?email=katharina%40betanics.de&token=zQxlIGCrICaSvRuRCWX4vX...

Passwort: betester

I have basic knowledge in coding.

Thanks!

Best Kathie