Change the link associated to button in Welcome email

Hi all,

Does anyone know how to change the link associated with the blue “Go to Nextcloud” button in my screenshot below? This is a welcome/account creation email a user would receive upon having an account created for them in Nextcloud. Upon clicking the blue button, I would like the user to be taken to a certain link, but I am having trouble redirecting.

I am using the latest version of Nextcloud, 19.0.1 on CentOS 7.