You can quickly provide your developer access by adding them as a collaborator to your website. To add a collaborator, go to your Client Area > Websites. Find the desired website and click kebab menu right next to it. Then click on the Manage Users tab, scroll down, and hit Add Users, afterward you may select the Collaborator option.

Once accepted, your developer will have to log into their own Client Area. They won’t have access to your login and profile details, Email Marketing service, and they won’t be able to purchase any paid services. They will have access to the website’s control panel, except for the email management tools.