Go to your Optingun dashboard, and click on AWeber icon, this will reveal API Connect button, clicking this button will redirect you to AWeber and login to your AWEber account and approve permissions to connect your API

Go to your forms or create new form, and navigate to Integrations tab using the left side menu, and from email software selector, select AWeber, this will connect to AWeber in real-time and you are allowed to add these subscribers to contacts and goal names to move users to, click on "Add Integration" button, now you should see the rule description on right side tab, after this, update your form by clicking the green button on left side menu as shown in the picture below with numbering.

This is all you need to do to connect your forms with AWeber, enjoy using it.