To collect subscribers to your newsletter on your Avoori website you may use the newsletter email opt-in module in the Page Designer. The module will allow you to place the subscription box on any page of your website.
Avoori Newsletters free plan is included with every Business Website and Online Store plans and offers up to 15,000 emails per month, unlimited subscribers, limited to 7,200 emails per day. See more information about the free plan and how to increase the sending limits here.
In cases where you need to place the content box outside of a page content area, for example, in a blog post, the side bar, site footer or any other area, you may create a layout with the newsletter email opt-in module and use the layout shortcode placement option to place your subscription box anywhere.
If you need to place a subscription box outside your website, you may refer to this article: Collecting Subscribers on External Websites to Your Avoori Newsletters using an Iframe.