From the search results, select the mention by clicking the check box next to their headline.
After you have selected the mentions you want to save, please click on the Save to Folder button. Here you have the option to either "Save to Folder" or "Save with Tag". After selecting "Save to folder", you can select your existing folders in the field to the right either using the drop-down arrow or by typing in the name of the folder. You can select multiple folders to where you want to save the selected articles.
If you'd like to tag the mentions at the same time, you can select the Save with Tag option and then select the tags the same way you selected the folders.
