First of all, you need to login mailchimp website and then you can see campaigns and click this. After click this My templates button and then click create template button.Follow below screenshot:
1.Create Template Button:
You will see default HTML code in your editor. Then select all code and remove their code and paste your custom HTML code.
2. Custom Template Builder
And then you can add custom code from editor. i.e. If you add image upload then add mc:edit=”section-name” inside img tag. Here section- name can be any name (i.e. header_image). You need to add HTML editor. You can add mc:edit=”section-name” in any HTML tag. Please follow the screenshot:
Then click this save button and you will see template. Click this Edit button .
3. Your Template
Then put your mouse over the template and see will see edit button and click this edit option & see html editor and update this content. At last click save & close button. You can see your template in popup preview. And at last click save button.
4. Html Editor
In this way, you can create a nice editable mailchimp template.
After Creating this Mailchimp template, you can start sending emails & successful in the email marketing campaign.