An autoresponder is an application that allows you to automatically send emails to your subscribers, based on certain conditions.
And an opt-in form can be easily added to ANY presell page, therefore not using it is only OK in the first 2-3 months of your affiliate marketing & Online Business journey.
If you are using SASPanel, you can easily add an opt-in form to any of your presell pages.
Once you are on the SAS page builder, look for the plus sign on the top right of the page.
Then look for the 'Subscribe Form' module on your page builder.
Just drag and drop it to your desired position on the page.
On the subscription form, select 'General' and select service type. If you are using Mailchimp, you can select Mailchimp from the drop-down option and add an account. This is the same process if you are using other autoresponder such as Aweber, Getresponse and etc.
You can check this link and watch the 3rd video to locate the API key on Mailchimp for your reference.
Then fill in the required filled the same as below.
Once that is set up, go to 'Success' and select 'Redirect' as success action and place your hoplink/promolink to the URL field.
Then go back to 'Buttons', change the button text, and other settings to your preference and don't forget to click SAVE.
Lastly, remove the unnecessary button on your page if you have a double call to action button.