This step will integrate concrete information in your iterator : Click on your iterator, then in the palette, search for the "Object" Step which is a container for the different elements that you will add to it. It is not necessary to give it a name as it will not be displayed in the response data. Now search in the Palette for the "Field" Step  and Drag & Drop it 3 times in your "object" folder (Name these 3 elements "title", "description" and "imageUrl")...
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As seen in the Animation, to bind the data, double-click the Iterator Step (named for_each_item) to display the Source Picker tab, open the item branch, and Drag & Drop the "TxT" element corresponding to the needed information in the different element steps and each time choose "Value" when prompted to set the value property of the Step.
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Note : For the ImageUrl Step, you will have to manually modify the xPath "//document/transaction/document/rss/
channel/item/group/content/@url"
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by adding "[1]" after the "/content" :
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"//document/transaction/document/rss/
channel/item/group/content[1]/@url"
To do so, click on the item => group => content => Attributes =>url. The xPath is automatically computed and then you can edit it. When it is done, Drag & Drop the "xPath" text to the imageUrl Step and choose "Value" to set the value property of the Step.
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Now right click your sequence and execute it, the right window will show you in the code only the information you required.