How to customize Login Portal Page in JSD

[VTB_SAM3]

https://confluence.atlassian.com/servicedesk/a-stylish-new-portal-for-jira-service-desk-server-and-data-center-customers-963663645.html?&_ga=2.19910776.1914795007.1590110891-444872971.1590110891#AstylishnewportalforJiraServiceDeskServerandDataCentercustomers-loginCustomizableloginscreen

I want to add a link in Login Portal Page in JSD. I see answer as below

https://community.atlassian.com/t5/Jira-Service-Desk-questions/How-do-I-customize-the-Login-Page-at-the-JSD-portal/qaq-p/1328693

But when I Add announcements, it not appear in Login Page. I want to add a link in Login Page, Please hepl me

[Stefan Krooshof]

I suspect you are looking to customize the Login page from the wrong location, a specific Service Desk customer portal. This is where you find the Add announcement button. 
{{jiraUrl}}/servicedesk/customer/portal/{{portalId}}

Instead, you need to go up a level, to the Help Center: {{jiraUrl}}/servicedesk/customer/portals

Here you find the Customize button. 
 

From where you can "Add login announcement".