In DotNetNuke you can configure the containers used for modules at different places. One of the options is to fix the container in a given pane from the skin definition. This can save a lot of time when adding new modules to the site if you know in advance that all modules in a given pane should share the same design.

This is commonly used, for example, in a media pane, where you will always include images for banner purposes.

PSDtoDNN video on how to insert a new DNN module and position it between 2 existing modules within a pane.

Short PSDtoDNN video covering the steps involved in adding a module to your website pages through the admin control panel.