Hello,
Go the the Worflows home page by clicking on the link in the upper masthead. On the bottom of that page, in the section 'Other options' click on the button 'Configure your workflow menu'.
The next page lists all of your workflows. To place any at the top of your workflow list (found at the bottom of the left tool panel in the 'Analyze Data' view), mark the checkbox in the column 'Show in menu'.
All workflows are listed by default in the tool panel now, this just promotes the checked workflows to the top, where they can be quickly accessed and used "like a tool".
A bit more customization can be done, such as hiding intermediate workflow steps so that just the result dataset is active in the history. Do this in the workflow editor.
Thanks for using Galaxy,