Name your parameter, for example, in this case, I'm calling it 'lead'
Add the parameter name on the landing page where you want to display the parameter value. The parameter name will be enclosed in double curly brackets.
Now open the Page URL and add the parameter name with a question mark so that you can pass the parameter name and value along with the URL.
For example, if the lead's name is John, and the Page URL is https://test2.excaaa.com/ubsub-test, I can pass the Parameter 'lead' with the value 'John' using this URL: https://test2.excaaa.com/ubsub-test?lead=John
Send this email to the lead so that it opens their name, you will use the value "contact.name" instead of 'John' so that it displays their name. In our example, the URL would look like this: https://test2.excaaa.com/ubsub-test?lead={{contact.name}}
Send this to the lead in the email and test.
You can add the link with the URL parameters to the previous step of the funnel, using the redirect options for the button/form/survey/calendar.